Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ca6bad6a4aab2e…

MALICIOUS

PDF

91.3 KB Created: 2021-09-06 16:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e82c951a0f7869ecd9f02c7d6a752c12 SHA-1: e8c2f4f3dd9f0f8009bde1182287734326e9f419 SHA-256: b6ca6bad6a4aab2edbf1113a8db52c41211bff1b394a9c66547859bd20084c2d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://garglob.ru/uplcv?utm_term=rrb+group+d+recruitment+2018+notification+pdf+download PDF link annotation
    • http://aweibel.com/Photo/file/23296438893.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd265148e1---93789866688.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/44t2322g7eqmg33tsj3n6iae1g/30049823119.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/75755415246.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/sidizirazopepojezuvujir.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/kapazebipikipuganujeb.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/kozozuro.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/17ba65bf2b7df51e2861405199fc7dfa/jofilerixapojitavitizob.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/gazototavuz.pdfIn PDF document text
    • http://22743333.com/userfiles/files/41210672620.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/c33b5c5f6c1830b95a7517811f200d1a/bikamojawofuba.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607978fc121c6---7123582579.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/fatisigivozejojar.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/5598537f993af1d1a76d61b0ea364c7e/sogukusofowomowas.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/93446371192.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/19422285989.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/zulamelejufojupo.pdfIn PDF document text
    • https://advik.net/userfiles/file/vexovudemidutaxexapozal.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/nefiralesivodot.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088926b8b99a---83709456634.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210614_211857.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/54469333193.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/dolonivazimaw.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef477d9264---7478882415.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/sexemopawijog.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c190ea6339d---85416806265.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086f899ebd27---refiz.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_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 11668 bytes
SHA-256: b7c82135897fedf53c8d4c9f9bfe5b421f5c073ad10c7411f38fdc2a742f67a8
font_01_sfnt_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 18476 bytes
SHA-256: 7994874dfee74c6b00a09a577a67b9b71af7276078341d0893e38854477477d5
font_02_sfnt_off00014761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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