Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3ee53b7c9fa602…

MALICIOUS

PDF

81.9 KB Created: 2021-06-24 07:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b94d21e83d51cdb1cb9741f242376a1c SHA-1: 154b446bdd68f08fccc2abfd72c9d5b0b2c37ab7 SHA-256: 7c3ee53b7c9fa602e506ee4c13e614ac2d9c9d900c0a72ba4dcf5479da4946bb
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The document body, though partially corrupted, indicates a lure related to installing a game mod, likely to trick users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=how+to+install+great+war+mod PDF link annotation
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a3199d985b9ce0c752cf04d3319510b2/tifarexoxufelozes.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/3411677168.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074c37666266---96772186701.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105250833348881.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hoppa94b2ef3uu89bnrdnnoio4/dubowotosutevapexuwul.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/62670591669.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/86381814093.pdfIn PDF document text
    • https://signika.pl/Upload/file/79338000466.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/wuveteluduworejasuvive.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607805dfbdf99---67577434204.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/pevekibimabomivaxes.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/85e558a53c22a9016eb6bb950fc6de2c/55317606565.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/07fc41d454ce74a4e9560144368e6835/19257997329.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1bc2bf92ef552ac33a74705e597d6e72/mobutebobobulatewugetomim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 4988 bytes
SHA-256: 9dccaa0e1ab79ff2ef04fe5ba95b086edf306ad78a81e854c97eb009686aa9dd
font_01_sfnt_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 13196 bytes
SHA-256: 270da35d67c7536b1a33e1b4de875c93da4649cb20a651541525bb48b5ada361
font_02_sfnt_off00012ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE2 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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