Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c277dedfa48fbd8…

MALICIOUS

PDF

78.9 KB Created: 2021-07-06 19:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94acbc3df30d74b0669b16afd4583b89 SHA-1: 9d5bdaf978b61604c6c4c91dfed3ba8bb02d0a7d SHA-256: 9c277dedfa48fbd8bb5304bc369e2151c8a3c5b38d7a5aafd0bd3c4e9c617569
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://handbook.hu/upload/page/file/titinabopebemone.pdf
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/wetaradoditikugozo.pdf
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210624093535.pdf
    • http://etcad.net/np/upfile/file/90775089919.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aad88bb9227---farejefuzob.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/dskt7amodhapcj19gfd05mngje/zijadako.pdf
    • https://planet-for-events.de/userfiles/file/funuzog.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/809a100bf6240920359649e95cc09d90/48755060096.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/3e7098u3dbg8sitqas2bl0fmc2/72422511888.pdf
    • https://all-stage-meditation.tw/uploads/files/60bc0a3a5ae53.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/cbdce4cae9e97c7aa1a80762635946ae/48529974106.pdf
    • http://kirilmazbardak.com/userfiles/file/fipilixetodobafagava.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e644b3092---18893598807.pdf
    • https://alihuata.com/userfiles/file/lavan.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7116cc9228f3709848d8f7d4e99edbc2/36978767391.pdf
    • https://habibitours.com/ckfinder/userfiles/files/jususovavivuledexaju.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/7a2cca4da91063e51bea69893329a82f/15729327867.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62de484dd---tejusosojolif.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07257af10b---47985735798.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160acce341133d---vigaxiwodoxofofujat.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084520f5c8df---faparunabov.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gexukifo.pdf
    • http://delshadian.com/public/userfiles/file/vugepulanoridowiwevedetar.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=inequality+notation+calculator
    • 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_off0000d176.bin
a4b77adaf4be8f7b3137c29de866c1bda8cef9c9ab10d8fd16ca67162e258b9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD176 10364 bytes
font_01_sfnt_off0000e8fa.bin
f2a05b2b4b489cd0ff0a7bd85102097b84bc569301db411b99ec1d9974b1c231
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 17380 bytes
font_02_sfnt_off00011641.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 16792 bytes