Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43a9aa354f17670…

MALICIOUS

PDF

68.1 KB Created: 2021-05-06 12:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a1b4cbd8d172193ef732d8f91ce4240 SHA-1: 5951b53037cda3b556ab314a9a86619e1290458b SHA-256: f43a9aa354f17670d612e31f03e3a3f878ba8de74455892a07cb034264f18ef1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://philabc.ru/uplcv?utm_term=cake+serving+guide+uk
    • https://ludifrance.fr/userfiles/file/regujeme.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/665b55c5874e81a3a4f7303974ff77e6/3856973295.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d098cf4154---mirabadixovut.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/1d1164c3672f89c76692e6a308a2f228/61539499843.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb82167781---34338442660.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c4364322---9148107634.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/2fjdf7qq50jo9khjr2p2n664ik/97822375568.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882a1ab2776---mozixiz.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8eedfe51f6cf80e463a7aa95b61833ff/41312464973.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c3191d11---84777854852.pdf
    • http://ahkjt.com/upfile/file/tovexoropapuwarapid.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853e29850ff---86273554654.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4861741fc---luvufawitujemiju.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/0fjcbhg13nvkb0gvnu7jec9glb/68113291770.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_off0000cddf.bin
c0cfcb07b096f5e29bd1806f5c47c85fba7fb6f84fea34f471baece52dc94a9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDF 4992 bytes
font_01_sfnt_off0000deef.bin
0d886b7cbebdceff195b1b36fc1c61f38971808c08e7dfe7be1b90b6bd398b82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEF 11052 bytes

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