Malicious PDF — malware analysis report

Static analysis result for SHA-256 a965ba43bb912f75…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 16:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 555f64728371efa513d087b7f29b6d62 SHA-1: 7d9e80ec2c1ffa5dd0e77a1270257997cd022709 SHA-256: a965ba43bb912f751693b10651b0d808ee14f80482fab263d301641f604efdce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. Although no scripts were directly extracted, the nature of the URLs and the detection results point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ailizia.com/userfiles/tonawuguwawi.pdf In PDF document text
    • https://funke.be/data/file/625622470.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/71474744407.pdfIn PDF document text
    • https://mcsfood.com/images/file/43746488704.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/12745329194.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/82878138744.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210914083523.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/nuriromasamitid.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/76314195214.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137132c25ec7---jabaxozovutofexuj.pdfIn PDF document text
    • https://glozor.com/userfiles/file/xorisuboxifazobeseg.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/gogixipogelava.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/79588246731.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/15309202623.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/noporu.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/dotubutak.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/jowixagejudanitawuwip.pdfIn PDF document text
    • https://nevisnews.com/userfiles/86450144175.pdfIn PDF document text
    • http://mp-journal.com/media/file/18954798563.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/mibumujiketixuf.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2eab6ca95---gajudafufap.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/82419561396.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/74dfded65ee835351683b78067f63779/79049515217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=legally+blonde+ending+songPDF 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_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 18132 bytes
SHA-256: 406d52b02ace42ab25312a72bbe4688ef41bdda78382cd0125041aede0195e13
font_01_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C3 10436 bytes
SHA-256: 408051e2c1401cf8c201f62c090428c6de8fc576a7fd4dede66ada11aa4ed0ca