Malicious PDF — malware analysis report

Static analysis result for SHA-256 69e2b50203fe5ea6…

MALICIOUS

PDF

79.4 KB Created: 2021-06-18 07:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9b1445bd7adbba363d357091eec534c SHA-1: d7002d38422f9164ead89e4e087937ada5003839 SHA-256: 69e2b50203fe5ea627d409e0e6ffaa7c8b860fb01a1c22cf300adfcad8f4841f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress upload directories, with many distinct hosts and UTM parameters suggesting a phishing or scam attempt. The document body is heavily obfuscated and contains metadata related to wkhtmltopdf, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://m-co.de/wp-content/plugins/super-forms/uploads/php/files/v3l7d5ovese13tgsd1ssqv9rbv/74569488563.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082552e378d6---5002836785.pdf
    • http://pogservice.ru/userfiles/file/94590189555.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7858db82ce---derabosobejisofege.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fb4452366---nunugafa.pdf
    • http://pensjonatagat.pl/userfiles/file/783655201.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/8a479ae03c858e7fc3e0be9e2ec5c87f/2344852538.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8e49b0273---98240105466.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985271d06d0---bojadi.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080adc9655cd---kezerojum.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160860b70004b9---jidarinomoli.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4a02774142512eff7f6ac6ed9dac9a91/mozexipojilexobabifodukop.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/xakomakamagibatumozus.pdf
    • http://www.moyekolodin.com/files/69430344826.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=kristy+wicks+net+worth
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7f.bin
a4033718721aa63733c6bcfe3c13c716b1f4c43f470e3bb19f59293c0defb2c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 4872 bytes
font_01_sfnt_off0001001e.bin
aa800476e1cc84a5103dc3d20e986cae62907baab8e6b474c5d7a47807dff165		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 1584 bytes
font_02_sfnt_off00010827.bin
98d2957cc1f74e5652313a3fba9f565bee51bf5e3ca6393ba61be1358a41ec63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 11720 bytes

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