Malicious PDF — malware analysis report

Static analysis result for SHA-256 968ada70a5808da5…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 18:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 659c1e27bc603efdc8a56597000f05e9 SHA-1: b0c715a530763e6c2ce3829cf483c7004b6d1706 SHA-256: 968ada70a5808da5b846c24c868fe974290acb20700df1fb3c81a46d8acf37e7
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ML classifier and ClamAV, detecting it as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to external sites, including compromised CMS uploads. This suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://lafiestadelmoto.cz/files/file/92650366962.pdf
    • http://soepcentrale-dekeyser.be/userfiles/file/wanelafamiviwipal.pdf
    • http://waypl.pl/upload/File/89189120056.pdf
    • http://gbfrjournal.org/pds/userfiles/files/86183979279.pdf
    • http://norilskgu.ru/userfiles/file/motubuwigaxoxiwi.pdf
    • https://granitnet.hu/editor_up/rowolivobusipexi.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/opep1ciam0qljhll8otvdk8n6d/48177938391.pdf
    • http://betonkeritesek.eu/Content/files/ravumunuwanere.pdf
    • http://apothepharma.com/upload/files/baxonakajeburubesebewimi.pdf
    • https://tatvan.in/userfiles/file/favolivozobogova.pdf
    • http://tydafa.com/dafa/uploadfiles/20210910090000.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a71ih931a0o98ug9rs1hhsk5e5/8275823053.pdf
    • http://nguoiquangphianam.com/uploads/files/rajova.pdf
    • https://nmg.lv/img/uploads/files/birazibovejojevopusozij.pdf
    • http://na3.it/misc/file/68355983606.pdf
    • http://creaorganization.com/depo/sayfaresim/file/fawibeka.pdf
    • http://demkapi.com/resimler/files/67767908201.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb38c22cd---vulazebitapopazapu.pdf
    • https://tekartltd.com/upload/files/duzod.pdf
    • https://poojaindiangrill.com/nbloom/fckuploads/file/44781970098.pdf
    • http://suspensionestg.mx/userfiles/file/luzifutejevofujajojizib.pdf
    • http://jfe.hk/userfiles/13532848837.pdf
    • http://0851gay.org/userfiles/202109file/2021090313480270554.pdf
    • http://herium.net/FileData/ckfinder/files/20210909_387B66B1DA2B8029.pdf
    • http://kdbelektrotechniek.nl/uploads/file/1656764959.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=english+vocabulary+exercises+for+beginners+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd3d.bin
56b00ef5ec31e1a320ca00201a57c76426f0bb27713d10f2123e4f249c159f8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3D 16468 bytes
font_01_sfnt_off0000f7be.bin
1d803052e6cd279561326e25bf8a2c8ebe1d4a2251d02a3f094898618bf8cdec
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 11308 bytes
font_02_sfnt_off000111de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 16792 bytes