Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fafdcacf0b2a8b0…

MALICIOUS

PDF

91.6 KB Created: 2021-09-18 06:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1bd1d56a99b2930af83ec174d3ded5f SHA-1: d0ef3befdb3e93444d6d30a1bfe06937bbc7ff60 SHA-256: 3fafdcacf0b2a8b088463c36c006b6dec6d7d5919cc06af90d1d9a03dba22484
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/fusediwosopisitavodikemej.pdf
    • http://eventologia.com/userfiles/files/judow.pdf
    • https://theelementrama9.com/userfiles/files/24977777987.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ff0d41786---dipelusuwepigafenivepavid.pdf
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/xamunuzomapide.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161410afa40dba---belemefukabosiwexagis.pdf
    • http://dxline.eu/userfiles/file/papasoluvotalimoguduv.pdf
    • http://keyflounge.nl/userfiles/file/nuzakagideworudagifizuger.pdf
    • http://vektor-bezpeki.com/userfiles/files/73289935671.pdf
    • http://studiopedrazzini.eu/userfiles/files/87108442741.pdf
    • http://mrcookie.tw/upload/editor/file/020904423214.pdf
    • http://unibeauty.com.br/ckfinder/userfiles/files/8579184394.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bccb55994---4823125715.pdf
    • http://fizjoactiv.eu/Upload/file/86437308032.pdf
    • http://olgapolyakova.com/files/files/86277195773.pdf
    • http://offerparts.com/upload/files/dodorakuw.pdf
    • http://syntrend.critical.tw/upload/files/59262020734.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/najaxubuvivepix.pdf
    • https://castilloexterior.net/ckfinder/userfiles/files/xuxejidodila.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4967d37d58aabb6b25e3b7281475b4bc/rubet.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d6083bc9---93618488148.pdf
    • http://gerd-pollak.de/userfiles/file/11643205183.pdf
    • http://apex-architect.ru/images/file/vowewatowojomufi.pdf
    • http://studioindelicato.com/userfiles/files/vusumujaxupuvula.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=programma+android+per+scaricare+mp3
    • 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_off0000fd56.bin
a9f7679cc4a5e281f6b575b2a41803037e59d3ef5b81ca45bb242d3dfe8224e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 19440 bytes
font_01_sfnt_off00012fd4.bin
a88bc9d0286d6ae08c9253564571085246f2cf62bb9320054f1deba75b621c3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD4 10888 bytes
font_02_sfnt_off000148ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x148CA 16792 bytes