Malicious PDF — malware analysis report

Static analysis result for SHA-256 281a36e8e1294021…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 02:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06a95e5347d1d939747924463fbcc0ee SHA-1: 1ae3663b4209bb89cf1dba470a5324c0bca352f9 SHA-256: 281a36e8e1294021e51fce36ecb3de25737b173ac42076c1774ec42286191896
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://medvor.ru/uplcv?utm_term=anaerobic+bacteria+require+oxygen+to+live PDF link annotation
    • https://retta-bg.com/userfiles/naxemidifise.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zozamamerisunujopixu.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/11739315087.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba845feeb62---85485409523.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/31378725830.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/4ee59c6d4919672a132ada00200c5b74/zulunilinevitikoliza.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kevujadexudurojudaxixegib.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/88635921531.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/zefavepubevizutigixumewav.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/faa46690f04d1b5d07338784f9147c93/33402287883.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d7fe9e97---ragusigeko.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c936b42ff---kisewisoketadalob.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210804104416.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/faxabaxirile.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/lixokulowojefimaji.pdfIn PDF document text
    • http://screen.by/images/file/varuzesaninerotisakajadip.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160808818df21d---fuzikaxomijozatiwefi.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ccb564fda---87860982093.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021060606460494.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/rekewaxepuvupidose.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/51438033093.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/xezisizutavagew.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/atahfh8e56ud99iolgnkaanbg3/pawalinekotivox.pdfIn PDF document text
    • 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_off0000c11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11F 10884 bytes
SHA-256: 4d4df18c3d46672ac3b8aa8171d51589400a1519fefdef696f068dddad8a1b6e
font_01_sfnt_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 16776 bytes
SHA-256: 2e6f276b856f8549f8c11a68f805595fbe778d7c70eef4a3e04a16930d2b1f76
font_02_sfnt_off00010555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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