Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a427b2001381d80…

MALICIOUS

PDF

90.0 KB Created: 2021-09-13 15:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a4cac664966abaef01bbf2bf0b3adb9 SHA-1: ccd66cb272ed94c5c3c49e8e11a60c39473a0ea6 SHA-256: 2a427b2001381d806410a512a2df6631b0bb783340f03a7541f20d64c7844943
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDF files, indicating a link farm designed to manipulate search engine rankings or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it could be used to exploit vulnerabilities or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://murasakijr.com/uploads/files/jiboxesegevufof.pdf In PDF document text
    • http://geoass.eu/userfiles/files/33453661923.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/92856988532.pdfIn PDF document text
    • http://szwygs.com/upload/13430043072.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8aa82682---60306178059.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6svekr4n0jkre8snogft3mj032/fatekagexofenob.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/608959924.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613825849f57a---sokexaloxirisokalipaluki.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/86967705798.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/metugulorakabegeved.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a6e217f560e4c76104d56e5f76b9c45/6664727692.pdfIn PDF document text
    • https://wasael.com/userfiles/file/18091149824.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/61164251161.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16131d4372502b---madebo.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/73803079472.pdfIn PDF document text
    • http://groupkaishan.com/d/files/21167694734.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210902225040.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021971428377187.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-7/20210907070601671453.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/63745603882.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/15893495172.pdfIn PDF document text
    • http://scsychem.com/upload/files/fugonores.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+fancy+pants+adventure+world+1PDF 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_off0000f85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 11004 bytes
SHA-256: 480f6b42354dd888bb4e4cc51386803b7d74aaf457855b28c4346992e53fee5f
font_01_sfnt_off00011210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A22 18288 bytes
SHA-256: b88c8790931d9df7641da230c68763e796c78219ecbf5ff6fdb2e6fc81b517ad

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