Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d45a6de3832e496…

MALICIOUS

PDF

108.1 KB Created: 2021-06-28 14:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4631cf3131c74631a9fb8c3b97d09f86 SHA-1: 51bb8e672875895d53de4f213f783b165f337293 SHA-256: 3d45a6de3832e496460aa27b8c6e0f257bcc7bf707d7633ed6e13e61aa97f7df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://ferdavagnar.is/images/fck/file/fatuwevukine.pdf
    • https://aimara-bg.com/userfiles/file/97525827670.pdf
    • http://petra-dario.info/upload/datoteke/togosuwutabixoxirinij.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/9c8c53f56c89449994a666f510a87e35/85494844198.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d06f7bae9c629b693df160a61a23bbb1/78121218654.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf430c15258---14886183012.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/72fc9f6074c587ccb5daa1f4d916776e/56197833777.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/fotoguzovo.pdf
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/julabuxido.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/jt49vcmitpb7kqg0dbc0p8a2ld/89829626558.pdf
    • http://bagliodeimille.it/userfiles/files/suresegujodijofozewe.pdf
    • http://cropscipublisher.com/files/upfiles/file/kuxojapumakadipibafe.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/ocq0ddlutm49gillt891r7ajcd/gokatuxoxipugasewakejenuj.pdf
    • http://dermaktif.com/imgup/file/bapajiwebonufebakunoke.pdf
    • http://www.hgbehringer.de/img/files/files/kisolozu.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/rapemumimigozomadijupufa.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/tk0emtvp7rt9l6r6ct9k569id3/foruleweduseruzuxekupanu.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/bolujukofirofamojumamaz.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/768e393b8c5d839b21b41f4168a8c5a1/janabasiselibipilu.pdf
    • http://kirilmazbardak.com/userfiles/file/2021109789.pdf
    • https://implant-drill.com/userfiles/file/92733065825.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/d8ji2djg1o4kudrgn7d9i4e46k/95731442785.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608588dd59204---bafexusebesaf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=peabody+picture+vocabulary+test+pdf
    • 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_off00013fc3.bin
d5d28f04952ce68c64ef86c78db8b5270fb7b28338c4b9ce4e70bf9063d13fee
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC3 10928 bytes
font_01_sfnt_off00015911.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15911 16792 bytes
font_02_sfnt_off00017123.bin
8dd9565892f001981bb5f9ff3e815c4514101529ffc5371ca1a1caf8ef21bf18
pdf-font-stream PDF embedded font (sfnt) at offset 0x17123 18936 bytes