Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e5d252dbdf829b…

MALICIOUS

PDF

113.5 KB Created: 2021-06-21 06:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a5690f728893dab3b0a0cb85298b62e0 SHA-1: 7c14e85b9d0fdc29f7ef450867194100bb46036b SHA-256: f9e5d252dbdf829bbc32a01b9691dbdd858dc6dc9f93b03a6c5c9b595cc5aca6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://animationcoach.com/userfiles/file/56539987591.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c177a4b4320---82676329079.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/93937968242.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210621_024236.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/bodibikitotuketower.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/mofugavowejoludep.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/8488710512.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/70unvsnqtgbvd74qhjggmlknrl/wojelodamawo.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb57a0156b---fipibikuvedibupulota.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a3a55eb61---74832799117.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68b13bccbc---lorige.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16076b7c67f181---pavikibibapilixuw.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c4476e923---tevefotenesesujogun.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0c7a138bf1496ad1dfec46e5f871d055/rivukejapunudopopugituso.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607f477accd5c---55023673962.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/jixobalopelufisazizozune.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=monster+hunter+generations+ultimate+switch+axe+guidePDF 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://scripts.sil.org/OFLIn 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_off00016a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A46 5516 bytes
SHA-256: 4f969afa57ae11f172cc5e644a49d740606bbb85be3f5f3ed6b8dc63db46be17
font_01_sfnt_off00017cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CFD 10924 bytes
SHA-256: 63971838d0892bbd04d7cdd56a8419988188643974271ca3c95a9ba597aade73
font_02_sfnt_off0001a239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A239 16220 bytes
SHA-256: 5e643e5be40b16dc9e4688173d2b531f1cc92543752ea3d0c7924160a6666bfc