Malicious PDF — malware analysis report

Static analysis result for SHA-256 68988a608f8d824d…

MALICIOUS

PDF

63.6 KB Created: 2021-06-22 21:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2b5f7b173796eec3bebc0ef21081acb0 SHA-1: beda7a0878d56a84e0b93feb745588f03e79ca46 SHA-256: 68988a608f8d824d88b9d64740837ffa354dc0295654fed10f3143cce3d2e6b4
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 5

  • 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
  • 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://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/5bsj59k82lsdej1bmq2oed8r2j/85736932933.pdf In PDF document text
    • http://aeronautike.com/userfiles/file/29996944601.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/34019168426.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/2574260884.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c333552521e---70255034820.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d938c4e9---vufopalobavu.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/kajozuxulibejeb.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dde96dd1d4---2652691442.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c380b66c5---86076351526.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/28263367809.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/61667681755.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3b9dd67e4---manedubazidasodavu.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/516169122203cf9d99b1fc1bef895829/zeletimetogevosatami.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/becqaclgq4q36rnh49bda681dc/45771152716.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c42d3e1acad---vebiselibemapupiwariv.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c404a889a7---77720719906.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=braindom+level+27PDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1A 4820 bytes
SHA-256: 287ff11799cff057fa1c583b865037d2d24512a2178841fb335cba75e6bab3b9
font_01_sfnt_off0000cf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF59 9972 bytes
SHA-256: 6520816a893b4e67a437558537e7d4409488d9468e5da6944a6aae64322fdc3e
font_02_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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