Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae51fb9d947d512f…

MALICIOUS

PDF

71.6 KB Created: 2021-09-30 20:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f588640c0098ad0e6c454eae68cdeeb9 SHA-1: c542038726a3cf556d4fbf390e6e100f8110eba8 SHA-256: ae51fb9d947d512f84fda9263417cee28980bed36221101ba871c9c68008351e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of external URI and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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
  • 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://wizclub.net/upload/userfiles/file/tasanejevofuxi.pdf In PDF document text
    • http://sarkanyhajo.hu/files/file/49844199531.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/26750400841.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/gaxovepuduvabefekos.pdfIn PDF document text
    • http://allier-genealogie.org/File:/regisajiregufinag.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/katozojifumajozare.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/34846234026.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210926_214524.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/51181977823.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/35930809426.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/xodoxupumiwobifilajuwev.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/desotugebafudutavufikewix.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/zovareni.pdfIn PDF document text
    • https://epiphanych.com/images/file/vapujexokumogusuneru.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/26348522605.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/43127342393.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614289ede8f2d---67646021226.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/jogexiramujedabelelu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a2f8f012a---woriwipovanuwuvi.pdfIn PDF document text
    • http://klemanpince.hu/files/file/pogiz.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/51750277795.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/44348193178.pdfIn PDF document text
    • http://auvergne.annuaire-regional.com/ckfinder/userfiles/files/31328611590.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/62986339843.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/16773580897.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614f018b8fcf9---35194794468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mod+apk+friday+night+funkinPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AC 10728 bytes
SHA-256: c742b5398617f44036f5f49d3e0efcad4de21c5d3a1add0c8fddacaede76100f
font_01_sfnt_off0000ce0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 16984 bytes
SHA-256: 040133c2993997e330c73910358ac172bf6d2aab8313ee35d3942b5fcae8cbc8

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