Malicious PDF — malware analysis report

Static analysis result for SHA-256 980b906deb2aa3b4…

MALICIOUS

PDF

87.4 KB Created: 2021-09-02 10:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 345a1b6359cf13ede001ad304f23d843 SHA-1: c47b8697e5079c622f68290ca9b6bf81919a514b SHA-256: 980b906deb2aa3b47fe750593db5deb94de5bbd0fd098db2f63ccf7419095b9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users. The PDF's structure and the presence of multiple external URIs suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://atlonnuri.org/UpLoadImage/editer/files/51939248107.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/iq4fp72t0buanbgni28jo365li/96498922501.pdf
    • http://testplanet.nl/uploads/files/simaf.pdf
    • http://kazuma.ru/ckfinder/userfiles/files/riwifokafojalufaj.pdf
    • https://tsafar.ir/basefile/tsafarir/files/14939432370.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078519341d7b---purovatunemezanosalosopa.pdf
    • https://marupyara.com/fotos/userfiles/file/nuwikav.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-6/20210506170904964186.pdf
    • http://inannamsao.com/uploads/files/70249162639.pdf
    • https://implant-drill.com/userfiles/file/54612704570.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8f15435456119728d6e4db1ea2fcdb17/20194143155.pdf
    • http://yonseri.org/userfiles/files/ruwakafezazisoxunisex.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/9coqfuv92nd8423stps8f7cbt8/vebatof.pdf
    • https://ludifrance.fr/userfiles/file/soganavud.pdf
    • http://bociany.sk/media/file/nelurulaxoxik.pdf
    • http://mgocsm.in/userfiles/file/49564105526.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/1f0c35544e300f6397a915e795c31192/77047327912.pdf
    • http://siamsnail.com/media/userfiles/files/fufofogadosodawafesape.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jb4qi863p7marfr97oopjtrvs2/7591511262.pdf
    • https://paeonia.ch/userfiles/files/xuvoxutifo.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c84ac6ddabd8585c15a3e9b75bbf0676/fovapufumi.pdf
    • http://15881588.com/ckupload/files/95489762847.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b7f8e95294815e7f941e944c6f290f88/takibuledebul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bacterial+infection+foreskin
    • 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_off0000f25a.bin
f207668cb86504d6f7e870c433b213d3e43ef9e77dfa67405d5e8dcf2ef5ab44
pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 17600 bytes
font_01_sfnt_off00011fec.bin
a2b0a29465bd2a68c4285ba3b54f6ff5defef8eb4fba81017e224f3b34135b94
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEC 10472 bytes
font_02_sfnt_off000137dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137DD 16792 bytes