Malicious PDF — malware analysis report

Static analysis result for SHA-256 2451b3d720ba813c…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 04:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dde5c12826ff71e9751c26981e353dc3 SHA-1: ecd914d7a2d6e22285ff24ac0ee74ecc45c8c734 SHA-256: 2451b3d720ba813c50f694b6b7eaf94241bd387bb8b629f12559e4a97209bfba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to distribute malicious content or phish users through seemingly legitimate but compromised infrastructure. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=occupational+stress+index+by+srivastava+and+singh+manual PDF link annotation
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98d209277---rokedoverinoduzebud.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/a4dbcr6mm4a7a45jirmg6ofmcj/5889550744.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/12437925412.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf669d361---famajinagexu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/eec764534c8dc3c11d53847953bae2a8/dafururijexaxiwomaj.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/solalijule.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf793b88ec---wusotoxokuwozatid.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/posazojelevutuful.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/tafivojusarod.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/62122922499.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/qkcnji6diovocsuako5ibmhorv/wawivijipegafetovumes.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/ruxunumimivej.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/vabadivi.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/87855474753.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/pigupulugijuzotewonuju.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/18331805609.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/nevudopupisadulasopuxubib.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c3cf02c89907445c031ca4301b6d62b1/dosodonekevunoloxutod.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/jt8ekdnc2spfljlpnt9t4lhq7e/43335998931.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8183bc20dbbc4a393a9c744fcf6e67e8/mademap.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/mqnonbr75p42pvjjiga58760su/vuwipa.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/sakonodobu.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/422262676.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_off0000e394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 17660 bytes
SHA-256: 940942f3ddd8891ac77b5544f03ab879d78e2f6d09a454fee2ee9fcae08d84be
font_02_sfnt_off000129c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C1 11508 bytes
SHA-256: 0ad5392637b16ecbfa1c462b7d290f0626d0ab0e296daf981aa7d60a156b851f

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