Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d29b374fa35677…

MALICIOUS

PDF

71.2 KB Created: 2021-09-05 23:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a5175ad08eb0afeed14d0133b456f2e1 SHA-1: 2dcd142a416d425070e064ddfa68535c8fd95728 SHA-256: 37d29b374fa3567754b3936b30736a5b651bec56a0fff1ed8376ca7dbeeda07a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggests a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a second-stage payload or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fogathajtohirek.hu/fckfiles/file/17369969595.pdf In PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/74984d2c98fce114f46c827b56c54c5a/sufepakuludokeluwil.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4aca10e381c32208490670d6cc78d40f/59005546229.pdfIn PDF document text
    • http://dsagco.com/Upload/file/zomilawunamorixoteguloj.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/kiwegojagodutaloguwaji.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ktbhee2u48ttbd8qjfioa3b7l2/93165811034.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/lixanazewuke.pdfIn PDF document text
    • http://eventechsite.com/files/files/zepodewexol.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/93gqfbl6lg1ctnr2ec1jmugdbg/55861286603.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9871ec7daed4915d5ae8812f3e19c6ee/67495556256.pdfIn PDF document text
    • http://islandpointfl.com/userimages/pivuwevekakozeti.pdfIn PDF document text
    • http://topp.pl/_topp/file/begilusoka.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/29997927563.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/61064049926.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/bizukabexogubewozok.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/q6sdhf295pffpvb96l7gvm6cj4/77089712177.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089a13775327---lumozezositetujevaj.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/98344452130.pdfIn PDF document text
    • https://webmenuplus.com/images/file/93204987598.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/22902087978.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/nekogiweren.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/slknvlqetrl09kgc5sabn3diff/28336642050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ap+dsc+tgt+syllabus+2018+pdf+downloadPDF 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_off0000b425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB425 15892 bytes
SHA-256: 1ff7fd4fec1b05447637bbe24f67d9b0e82a9c3da41847c9e0b0eb87b78dc156
font_01_sfnt_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 11396 bytes
SHA-256: b2195a84471e8064eadcccfb497023a4eed9ff78a1c41a3d6c5e0f8f39b1d70a
font_02_sfnt_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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