Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ec9cd222a35e66…

MALICIOUS

PDF

130.6 KB Created: 2021-06-28 14:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2b862a827fe8838e6e7254784607154f SHA-1: 5b7fab15bc04643f44f2385b966a4c7aef0ada0f SHA-256: e7ec9cd222a35e66ae8423ffa962c624a15b7aa4ed67e115a8a4ceb8922ec91b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9606

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ed811502b---xezumakixelutonufadabisex.pdf In PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807e27975d9---fizosejawebegetodipawoza.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/7135177307.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7beb3aea8b---70898197297.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jufa4gjjt0b35uscjapc3svjc5/15476321736.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/45496066157.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/91117036610.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57773cdef6---ravuponosu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609748a8e4454---71423297561.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/2d12e4c12fc1eb55d5048fc1b6e80dab/teleka.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/40157518862.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b93a9b5b163---ronofosunejov.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/69183049366.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab96bbd3549---betibeloxax.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/16e6v7j9vp1j53bufqpu3dl5mj/36700364515.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/u30tat4jmouto8iv9pdfmktnmq/vukivabubarapisovejik.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/gupafosozojoxowononigus.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/rejutizo.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab8bcc94d---kavukamivudavatupab.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/32495661309.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e495a780b---vugepuxez.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/530uh91c5iu372r3vcr6a4re97/2403653705.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/punomavekojukatokozolit.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909633c079d---rukobupi.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/62bb70ccacd61d3af9fe9b417ba23ada/17948332474.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/33571547346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=meiosis+cell+division+notesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C2A 10160 bytes
SHA-256: 9d134f11eb3b4b3086646e3301af26b35443896fa2ba01671944ce1f3cbe3979
font_01_sfnt_off00019309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ab1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB1B 19600 bytes
SHA-256: 4335edd67764712d86ba6821416c80ad83f6d424dcbb0bcd03d87aea49138bb9
font_03_sfnt_off0001deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEB1 18488 bytes
SHA-256: 2576b63494a3ac90a27f917e55aaaa16391d24f8cf6ad99a91bfd4fa1032c836

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