Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b85f34bb320c091…

MALICIOUS

PDF

82.5 KB Created: 2021-08-03 11:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e140b9451adb9657f2c69a5d3860f66a SHA-1: ca00e03ffa5295bb964630ef246134447c8f939c SHA-256: 0b85f34bb320c09174a9abf7e8dffcb679165982624300ecd6e1793f7325f894
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous compromised websites and disposable hosting domains. The embedded URLs suggest a phishing or malware distribution attempt, likely disguised as helpful content.

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 https://huntic.ru/uplcv?utm_term=how+do+i+replace+my+food+stamp+card+texas PDF link annotation
    • https://cursosadistanciayonline.com/medios//files/nakaxutuvenuwopazoxab.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a44aea2c05e---bazefanor.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/57747094340.pdfIn PDF document text
    • https://inifd.london/uploads/file/30835346103.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/137961f0064b11f3c386f56ffafa0e3d/93841515253.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/rifedimabajisupikaru.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/h73jam2ec8a21oi3ihr05ddhi4/80930690962.pdfIn PDF document text
    • https://tepihtrava.rs//files/24835789232.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b78b83121f954d4a8d5b8d19f0ee7a3/16016863292.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/f2e5835cd69e37f6a0e6303c72ae2b66/jamewuvezukixab.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/1dgl8pcqf5sh8vus05hobumrl2/binudozet.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/ditorezakoweworopiza.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/44694659553.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/47478725720.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/44190064223.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e63e6e57f3c---23202327067.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/10040903986.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf23b7bfd7---noferopimoxix.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/fb274da607181c445b47e0fe903b1e70/67433945178.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6614b62bb0---9034341832.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06ac9be497---bibokifafavekato.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/517ce16b4cf1652cf4b5dd42f1955a5e/32441763289.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/tumisixadorot.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/4573782995.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_off0000dec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC1 16648 bytes
SHA-256: 0de447f2b26009d508d708e5871621d9d1ac7778852ef37b6f0344fc95f93991
font_01_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001222d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222D 10968 bytes
SHA-256: 73b8b18dd2fc73881f644019a1ec599296caa42785cae62baf5e6b9afdb6852e

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