Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfae4d5f49705a61…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 17:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e9773b33263cbf01d0b46f1913b3759 SHA-1: 19ef277fdd4309c2a1ab46b33cbf57060ed6cdfa SHA-256: bfae4d5f49705a6133bf84d1a23179f760e3c2877b43139a74876ab0e1becffc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, which is a common tactic for phishing or distributing further malware. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://archism.ru/uplcv?utm_term=creative+sound+blasterx+g5+user+manual PDF link annotation
    • http://vdavloeren.be/userfiles/files/9072268182.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074ade12813e---61083804645.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/6770022605.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608949f696a3b---bopubilaw.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161082283c31e7---wotomawu.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/72509a455fc9b269a20360eac8f12f87/31289212173.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/21866141902.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/7379d617e3d9e03590bf85e95882ccbb/fejezelitegavamolebogaru.pdfIn PDF document text
    • https://togeltop.net/contents//files/27004386775.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b9be1214d---50910851188.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/10776295542.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5lc4jsllj8qgt36u80dv1b8s9q/jukifita.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/9768059719.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/divaponibajogu.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/23551269137.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/40248244617.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/99594122333.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/gogokela.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/novuzezok.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/9477424706.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/051ace8de7f225e2ad2f315abb417b30/25794521851.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/purukojaji.pdfIn PDF document text
    • 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_off0000da2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2E 19264 bytes
SHA-256: a5fedf117f6b1b7a46f48b5b474a0c1ef38b1924e5821eb4582b36c4a9fcb28b
font_01_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 11164 bytes
SHA-256: e61db5937340d446da8a3d9df28ed60bff2feddcfe0e3f4270e64df51653d9c4
font_02_sfnt_off0001251a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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