Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd781578340b7cb…

MALICIOUS

PDF

61.1 KB Created: 2021-06-12 20:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 336aeed1afafa59ebccb8d1ad591a53a SHA-1: e5c260386ad0aba029288114ae3f0320e9dd7826 SHA-256: 6fd781578340b7cb76ef7cfb20af18e7b9cdccf52894c9462d18eae4a84252c5
154 Risk Score

Malware Insights

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

The PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards exploitation for client execution, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=mo4+mobile+movies
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/egf4bip6r6resqqn1sshos1i0f/82319391117.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/991c67713cb1d0a46c5b153b1b140844/65841123478.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mv7otacjclb2v8qv38a6rk338t/tilalakededuninarizin.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/52503ffbe1c295fa672066e93fe507c8/92068207826.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f952cd6f0b---80874411073.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d8bcd3770---54901150517.pdf
    • http://mulroyenvironmental.ie/userfiles/file/fizifuvuvujedapubolaza.pdf
    • https://ludifrance.fr/userfiles/file/15150092185.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d281531b1---pakominemovedesig.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ed5bde2ac2545007edabef8871e8ea24/gujoxaworunawaxibalo.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4da82ba8---34867767803.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16091428f74ace---16278848606.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e99be03a2---62556306623.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d433fe5338---nujonugujet.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/53acffd86df0056ad17e0801f8c651b6/jegejelofitogiloga.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160864eb076eb1---detizijibirodotuvujajixik.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160929e6bde8bf---rafuxugovilululuz.pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35f.bin
9d48e8b21be8702783bd074e4253b163ce3ca530f8bb28c8ccec6af17526af56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 2856 bytes

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