Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1644e4d44e227d…

MALICIOUS

PDF

78.4 KB Created: 2021-08-09 23:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8be0f844d389d28b9a03b9f8984560c4 SHA-1: dd8d2c42564a9eda1b622785180eba1cbaba0b1a SHA-256: 2c1644e4d44e227de611669c464c39cc48c6bf2b06cabccab51c493f39eabc39
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/r02tpuvaqd6gf362jgt952g8cn/12411634874.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160acfd9518466---gigokovuxotixisijon.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/1ed7cdcdd447494f0b3ebedecf18870c/58261481233.pdf
    • http://masan315.net/board/imagefile/file/tijamako.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/601e0f232dc61dc93e3d17887175ae07/34959595417.pdf
    • https://eghamatyab.com/basefile/bainbookcom/files/40564328996.pdf
    • https://hmanagement.net/userfiles/file/dorekojomapeg.pdf
    • https://delcinfo.ru/img/files/files/5458171386.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f2f5eb53e---79172536128.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/5108ee2c1875c23f7416bd9b4714cfe7/fifilapizogitenavizu.pdf
    • https://midasspa.com/ckfinder/userfiles/files/68155830824.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877c2761f1c---46621462942.pdf
    • https://muzeumkonstancina.pl/attachments/file/55019396310.pdf
    • http://taskentcompany.com/userfiles/file/sirutajazapawosimole.pdf
    • http://www.amedna.com/userfiles/files/19875940201.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22ad36211---vivelepatu.pdf
    • http://beerskiboot.com/img/upload/file/2597296556.pdf
    • http://blessingsngo.in/userfiles/files/23282875684.pdf
    • https://fanaf.comarticle_ressources/file/kesekeguro.pdf
    • http://daonshop.com/files/fckeditor/file/17456959364.pdf
    • http://hsound.ro/images/custom/file/70371853204.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/vgonjku9akh6iu9p1aur69vlr0/dodamuxupon.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/77548712293.pdf
    • https://topupdana.com/contents//files/xotabalexufut.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=el+ahogado+m%C3%A1s+hermoso+del+mundo+pdf+preguntas+y+respuestas
    • 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_off0000cae8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE8 16792 bytes
font_01_sfnt_off0000e2fa.bin
0eaef05fbf7be0d4593fb05c06fb74f7b6a3e53486108e9da04847991c68692e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 17344 bytes
font_02_sfnt_off00010ed7.bin
4f4fac9e35a4c1fb08a8cf558211ae2f1846210d8092c3b486eee3675e9e8dd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 11232 bytes