Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8b0daed77d66f0…

MALICIOUS

PDF

91.0 KB Created: 2021-09-05 18:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76655f91c401400ba06437644a6cfc59 SHA-1: 0cca468aefe028d43ccfc6f7abc1bb4452045088 SHA-256: 1c8b0daed77d66f0f731ff25a5c4ee59b4ea89f46367099ad7c71161cd75bf66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://a2itsolutions.com/chop/multimedia/userfiles/file/82403947474.pdf In PDF document text
    • http://shmgec.com/Uploadfiles/files/puxaxasidesukos.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/iqgn9ai6alhuikq1k9o1j0qa33/ruzewotelav.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/kepinorukakopupuj.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721281364c5---posoxedixamafajir.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc45367fc2---72436308237.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5139a4e405---nozolopav.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608f994e1dc37---jamevosatosetadup.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/8685915661.pdfIn PDF document text
    • http://planetamama.ru/files/file/rajidomumo.pdfIn PDF document text
    • http://plncse.hu/php_data/file/wibefopofagorixe.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/jafukolazagufuxi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086f823bed3f---lukobetekefujuwimugexejup.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a595f00b3---wunizaku.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/32e76b29d69211dc3ac67d2c6fe4c011/36746394595.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/dejedorij.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30778c0655---dadovuz.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/kitaz.pdfIn PDF document text
    • http://orrizon.ru/images/file/sevewezof.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/jivozonoxatifefidi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c9272cb0a---83750786750.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/42124180611.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/cd7698e5a38b286d9dc704806ba57057/82439367752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=therese+raquin+pdf+englishPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 10768 bytes
SHA-256: 0d487160ff2e71034341c4b4097e6a5ba19b6eb545c8f0918386b70e8ab07774
font_01_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 18212 bytes
SHA-256: 35332dd1fadefd0c78cb0e2d995626eb5ed822e5f054669a3c6e8534b04e5fc0
font_02_sfnt_off0001449d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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