Malicious PDF — malware analysis report

Static analysis result for SHA-256 869cf53d126fef0e…

MALICIOUS

PDF

83.8 KB Created: 2021-06-28 23:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3276740f0ba1e3191c896a8a068db409 SHA-1: 49bad2014965edb2020a4338de96806336716756 SHA-256: 869cf53d126fef0e7351f39b47bc65109a0c3def63fb94951f6d561f582d03fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports the attack pattern of luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=north+eastern+coalfields+limited
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/06edf72f051c5a543e0b3489467e0474/boxitifojasaxaw.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab259e6118d---bebewitadowugiluteso.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/03a0hvqugbn8b8raef7403ha22/daleguzut.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/tbl85a01h0h4ct33pj54muqfrb/nusejeborukasewabupinuvu.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608448010dfc3---lukazovew.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d9fea0f23---jovilep.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2050ee59f---fudatokozorafuveliwunakar.pdf
    • http://assushop.com/userfiles/assushop.com/file/67958855519.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f28dd6dee---88184073874.pdf
    • http://pivotal-technologies.com/userfiles/file/90514614635.pdf
    • http://honda-vo.com/upload/file/risakanevukegixirobuxuj.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/9b3a8fa2f9ef74209920266e205e9aa0/javuverabizakotikakiv.pdf
    • https://vinadesigndanang.vn/uploads/image/files/35193096708.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/m1utca677ins8u2htdu3j0ocmr22a7e4/denifixukosokuz.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a26db280c14---21475511159.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a80f35254b---gumero.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/puvonidewaga.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d9aee545d0324db7eea129f653b8a035/xojiluzorakamasigufokoj.pdf
    • http://bocghedanang.com/media/ftp/file/61345904521.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c2f6ede7b---21593311443.pdf
    • https://cupanghitam.com/contents//files/jurafekonawelolobuxegi.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c14431ee290---lemotuke.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608722bb9f839---fuvugepapepumoti.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e280.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE280 16792 bytes
font_01_sfnt_off0000fa97.bin
c6b601b18389c77b1dbdf2dcacc74883420fa388cde31ff28e89d5894e1b8718		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 10716 bytes
font_02_sfnt_off000112f8.bin
2c2f120c4cbbac5ba50850421a982f0396fbba941a57223b613d67368d2ef164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112F8 17848 bytes

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