Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da45cd2c15fece1…

MALICIOUS

PDF

73.4 KB Created: 2021-05-05 20:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebb5636bd3c1674a63651e2ead0b9663 SHA-1: 705180bb34c730934574e5d6df4d6ebbea973226 SHA-256: 2da45cd2c15fece18095f992e34b995eae1a83849840e2b6f2f4a375df042fe6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the PDF is likely intended to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://medvor.ru/uplcv?utm_term=cmon+do+something+meme+template
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/29cbe0fcb5b6c859e1b17ef2af7f728e/89236353653.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/v6tkc4vfdr1vjkretmj8fs36k1/97964373098.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c58e771654e1d9b77a69212848266984/sififokaradawuzedisojupes.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c07500fa---malusulafejapopusalusax.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c341bcf0fd---73056997637.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/hl5s4sd3meubn40oul9lf6ipic/90098865439.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609233fe64b0c---zipafijaw.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e793ddf672---fefafaxuxibureluj.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/01c5292a786371b39a4736053196783c/deturavo.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160863141d2f24---82551395446.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5ceb5e0d9---1602113160.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/00uoeknarff0mfcvdn93r530dt/2749872059.pdf
    • http://apexibd.com/uploads/fck_uploads/file/fizomokomu.pdf
    • http://ajivikafinance.com/userfiles/file/82836373537.pdf
    • https://aslimitada.com/userfiles/file/47274154743.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5de.bin
756582ae88a3422300e5695404dd80a949ac42ab06316f99f290ec2aef956d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 5180 bytes
font_01_sfnt_off0000f756.bin
d3745008d73c670eb3eec338f59283c2a6893c42d38fd4f2276bcec47b1e3fd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 10080 bytes

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