Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0318151cd573e70…

MALICIOUS

PDF

90.1 KB Created: 2021-07-10 08:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d3981e18dcac5e2f6a15d7240a94ec1 SHA-1: d671a0cff9725c953b94ad07d72fdd00183c2181 SHA-256: b0318151cd573e70350dd7c37b35a4544eaab3e136c390c39ccd4fe7f91f49b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct domains, many of which appear to be compromised WordPress sites hosting PDF files. These links are likely intended to lead victims to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba221216f81---29550936477.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993270708de---jijorurijudiwijimebelojup.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095bcf226b62---18248630109.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160834019c28a7---7226812525.pdf
    • http://cp-1.ru/userfiles/files/katetodetogakolegarum.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/4d51tuha09qlrug7gdc88jihk7/79761332820.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853d06814d2---kabagimedomakuwagomuz.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd527b217b---44926023375.pdf
    • https://kibledergisi.net/resimler/files/22714332515.pdf
    • https://pet-fashion.ro/mm/file/15830702741.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74dae5f474---47705152292.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/bb2db4ea0b5b2dc3ab2c3f1b39fe51c1/tosekolaxowowot.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d422a258587---zemimaper.pdf
    • http://indecomavo.pl/inc/vunojowopevasadeb.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5debb60d1bab52514f8cb0a167c8d25d/gevitarep.pdf
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/nafinogenufatavivoku.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9f8f8207e51213f89f5940cf7f02129d/jososonixafaluxivanulid.pdf
    • https://menu2uplus.com/images/file/33516575861.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/68718806366.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/59371637326.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608566f422f4a---88699538268.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/0adbd537b4a4498e30b4ae55a76971cd/7432280098.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=vocabulary+to+describe+a+painting
    • 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_off0000fdbe.bin
f59a9e5abc907d172b43f7d491db1b2bd3e557af723885783e6a39ca8b9f2827
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 17232 bytes
font_01_sfnt_off000129fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129FE 16792 bytes
font_02_sfnt_off00014215.bin
d8ce1e5f639e0de4271d4f706c6b631fe115951366193f56de04691cec42055a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14215 11012 bytes