Malicious PDF — malware analysis report

Static analysis result for SHA-256 327bd46db623497e…

MALICIOUS

PDF

88.3 KB Created: 2021-09-01 13:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2b0f275647caec5ddaa540dc4823b6db SHA-1: e529dc379aaa72fb22d8d04f796ef7ca211fab5a SHA-256: 327bd46db623497eb7b41ca120a169eb8e5ae37b05984c236e99cb71862d023d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. This suggests the document is intended to lure users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ahdjcm.com/upload/files/70696059562.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/dmotql2h2fa4lo74r1auq2o2qt/5318978355.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021081411260173499.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/83517951385.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/82834343312.pdfIn PDF document text
    • http://bwc.lt/i/kowubijinofij.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098456a41681---wufinebelenikivej.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780cf9a7bb5---giwemozopufobid.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/81605212524.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tutuzulisede.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///liwulow.pdfIn PDF document text
    • https://laser123.com/geektic/files/dasarivotuvimotus.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/mewutojomeganog.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c008a1bd2da---49112416027.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2c1f69905ab82f4634b4b73765d8607f/33787897159.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160812c38d8aff---poxabetawurisixorojosaxo.pdfIn PDF document text
    • https://jetaime-shop.com/files/19578665835.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/lobukuxesasoruwazamojawuk.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021061520572173499.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/2eo1opd0mdvvccnioil7g7gpgc/sefazawopidutegugijil.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611e0744db503---12978240589.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/6d2c9e52c9972924f38627328cff18bb/vazesixivagezekebov.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/tedozuxe.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/e7533a8fe6e4e7d32bd7232228df8c45/fesovenumigobifeni.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610daf23d7c88---jawatagujikukorufuvuwoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=5x5+bench+workoutPDF 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_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 18880 bytes
SHA-256: 1a5d41e8ef84cc14d0cef69b0a34540952e2adff77a8bae120587e62b8c76ad9
font_01_sfnt_off00012385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9C 10416 bytes
SHA-256: 9b3f9c164939d1580f5e145ea5c16a7d38bfff88fe18d646b8e868ce1aedd3e9