Malicious PDF — malware analysis report

Static analysis result for SHA-256 f041526bfee2619d…

MALICIOUS

PDF

78.9 KB Created: 2021-06-15 13:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e09453b240c0cf4aeb0b63fb451c2bb4 SHA-1: 6f254092a6ab036b34169624f30679c407f88da9 SHA-256: f041526bfee2619d90e1c23ef8d0db12cdb4fc57f51c9b9fa5f788cd078edf0e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7095

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://pistant.ru/uplcv?utm_term=pokemon+randomizer+ds PDF link annotation
    • https://augsburger-dartliga.de/uploads/file/tujovirukomojixigatelab.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/71693203286.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/niwavugazavinimiluj.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/257807biguqk8l7kpl9tjjir81/simulonedovobamirox.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8bfc21748---96080720482.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20f6458ead---20200167613.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/416037ff7293a4bc88050b89f74a5486/68227514727.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/1jmnvkjfro7k7dtobrucnsscle/3074340155.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fe14276525e07a75d359745ea15c1a7a/wumasudarototewujiji.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/mufadelunabexijed.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/554598e6069fa3ded5e92c2ee9f118e9/ludemurotoraxovokuvofub.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad7b494f52---taveri.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/18024472453.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/64602146c0d06760b931977233b677f0/remobarudijofevoxirewu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/97853186772.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/4k1a4et5o2u4j7m7u1ug53co69/78342479341.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/12661447966.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 5052 bytes
SHA-256: a30168ca188617b54cf3dbb7074908006b63176a54fd09b65329b6eb30edffd5
font_01_sfnt_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 12100 bytes
SHA-256: 27d88f402ba213bc6dd6bb01d77653283092cb6b5b564fca451c4ac8f0279dc8

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