Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ca1414011d1cad…

MALICIOUS

PDF

86.6 KB Created: 2021-09-03 13:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84e7b9c09c6434d9ee1d68a0a15141a8 SHA-1: 5be412c74c449fb2f2f8d0b91f49e9e7771dbcf4 SHA-256: b2ca1414011d1cadf4faac37742891ce2fe195adc44b2fe7e12558df6a1fcb27
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm designed to redirect users to malicious sites. The presence of many distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and potentially track user engagement with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://huntic.ru/uplcv?utm_term=snc2p+animal+tissues+worksheet+answers PDF link annotation
    • https://angkaganjil.com/contents//files/waxifozezumorabomav.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce3fa10c98---11580226185.pdfIn PDF document text
    • http://metall-press.ru/files/dalisuves.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210819192522.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/zerefikogoga.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/fufukozatesibag.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39085340306.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/d5l9mqda0bh79p0g7hseao7jjl/20828007784.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ce53c7427---retifan.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/68199878720.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/c734f639a46559b1f1941e0c3beec39e/nadigamula.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/labetulukabozavelokozuse.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f422934955---58649344585.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/86552205829.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/supigirinimaru.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/n8naflhtli4djn93574vccprp4/18944428472.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/bd8c974429e176123c8af2c15df2207d/27145193396.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ae3d703d03e3519fce8ad0442d423b7d/bazalovipadufijil.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/kemalanibelolufare.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/b5dd7a6d2eaef6d734fb69eb5ca70854/mobavudimu.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a1acc51a1870a311bc71745b33a13cea/sugegefunezaleguxewuwava.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/nulatikenigawu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/741fcf973aa9ea95dac8feb94d52623b/wobega.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/bulodugazapesuxifuxigo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b53e926c6ca9382870eb0f042f27d232/wafevaburiz.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/lorobaridakito.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/03420b18aa97f4ccfd61a0888639bc32/pusigu.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_off0000e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 11112 bytes
SHA-256: b4488addeb1c39e616f2070816fe93ff3b2ea93b1209865fdb4a6a39fc516b4e
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 18276 bytes
SHA-256: aa4508fcd073c2ea9081c6d75e5ffdfde123bc604ff1d5c0a1cca8f8a409379b

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