Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c285727d55aac6d…

MALICIOUS

PDF

92.9 KB Created: 2021-07-04 12:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c956d3aed4e3cb5dfb85abf8cc277526 SHA-1: b79fb459c201bff48e7804f7653ac5df68f0f54d SHA-256: 0c285727d55aac6d8fd3796320e78e00e50bfb64c72e9d6c2897c3c44a54b6a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://clarksville.net/wysiwygfiles/file/limerozixusufamupo.pdf
    • http://bioident.pl/photos_fck/file/3163225175.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ea27e5acbdb53b6fff8bf8f939fa040a/80112393580.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/36amgioo9ulgkc3po4m4bfsqi0/jovijajoxafufazezixuvil.pdf
    • http://rehahomecare.com/upload/editor/files/jododibajorefizinoxili.pdf
    • https://cochleartudaskozpont.hu/files/74954005879.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/33f1d4f96a3e93f5af46b6f777c0ce01/61634589716.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb0e2c115---gurosegirulerivefovejo.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7mu75njj001q84tnqfsfaq9gl3/tevisikisisolapanowenuwuv.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7cbd1c106---84977427476.pdf
    • http://taeguektour.com/FileData/ckfinder/files/20210601_24664E6FB79B9B43.pdf
    • http://gd-weimi.com/upfolder/e/files/20210529170905.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b5a8493487c17888dbc2907fd17421d0/nanawesiza.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eb00a21ae---11694016906.pdf
    • http://zuche0551.com/upload/file/69432974482.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/31d55a82c5af622a14cb9d097d542594/vuborufusosekewazalebusem.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/1ded7b4aaa36a8c159e9b54efb408cbd/kaxubenujurawulixaruko.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6dc90a302a6ab454e73a67efbafdf423/34793531301.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c22b27658d---tufovolodegobezar.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c340b590d0---dimupesinajilejaribo.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fb9fd8a10---97109742460.pdf
    • http://divorcefinance.nl/uploads//file/gafuvutefugetowuw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=types+of+intussusception
    • 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_off000108a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 16792 bytes
font_01_sfnt_off000120b8.bin
3d243774532d41f5cd7fcd208ebfda88d9b81acb2c34a0af34090296fe3add77
pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 10344 bytes
font_02_sfnt_off00013845.bin
f1a3577aad3b6f983a67014678875283ac925eb89af538393ffaeaf6cdb4e66f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13845 17620 bytes