Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3d8262fac8f536…

MALICIOUS

PDF

84.1 KB Created: 2021-08-25 04:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 694e61f97e54580fb518aad7a9c02459 SHA-1: 1a162f37c1ed9ab18e420de7992e10661c5c2576 SHA-256: cc3d8262fac8f5365d8967fc9d0c0b0b064a03c5fcb8e7cfafb2919aeb4e9d82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of attempts to redirect users to malicious sites, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0t4gmhma5obqp45rri5eurcr9v/negosovapiwarudo.pdf In PDF document text
    • http://rkmaster.ru/uploads/files/28903573265.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160752d0a382e0---xedetagepiro.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609229ee97474---riwonosizubirotiv.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/7570469c6886da8ffb32c79ae3fb52ef/55382428546.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/43743620256.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160787720d58c1---77990934410.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/mv43s984dpgh13gfloj39vidp2/nojigo.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/bd605f2895aa84ec4e8b1e9636ca44f2/ximipow.pdfIn PDF document text
    • http://yuha.be/_files/file/fajulojokifofiweremazef.pdfIn PDF document text
    • http://geose.ru/userfiles/file/938080761.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210823/file/xapagusen.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/93558185203.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/n0nfvet3s813osg3pd9i4ljab1/68916772128.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/71826720060.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/i71i0skktnj665n26a410u0af2/xodefaxula.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/38469956660ffd7aeb7755.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/dc4ok92sfk4c693qjv2cm06ppt/bilonipinome.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/buwisirafapenotamatetiv.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4207c258b---zoseleturubor.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/9grna4tf8uua8aa1flljoa05ag/suwotavokafexakagigibepe.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/5853144811.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/1b41c9133fe6a7ddaa674fb88d5f78a7/sixifaxewupu.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/98087954944.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/pizibutovuzidaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=indian+heavy+metal+bandsPDF 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_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 10564 bytes
SHA-256: 4af9cbca1ea623bcad41b534b115463cd4eca99f85f758c93b3f90d2cf5f6c69
font_01_sfnt_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 16684 bytes
SHA-256: 5f00af3e4c9e9622df0298ae01306524ea8d8cd8f7d2f932f71c18eb5373bb3b
font_02_sfnt_off00012ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1