Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac076472e8b605e0…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 20:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 750d152e215ef5191b6f3d28ef374094 SHA-1: dc9d4aa8785dabe1b98c58136e6e0e45a6d65d60 SHA-256: ac076472e8b605e0886ce3395c9cb2ccd353719178381f31854706e29e21ee9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to redirect users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=gaming+phone+under+20000+in+bd PDF link annotation
    • http://kimyasaldubeller.com/upload/ckfinder/files/livojodotexonetudu.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/dagiri.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/84577464868.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/25928a204f0b943bf157b9db9c9dbe33/nixixefadabadeturiv.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0e25f45bf9b1dbad1ec44fcdbd1cf2a6/59974231645.pdfIn PDF document text
    • http://glendale.kopanramen.com/uploads/files/6579927343.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/gagadamezojidixabela.pdfIn PDF document text
    • http://underbutter.cz/download/foto/kunorovigefazimujir.pdfIn PDF document text
    • http://indexone.ru/upload/file/46813643700.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/52444486058.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/59285a23c6921cf7db3ac1604d39875a/laloje.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/razetadi.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/xolewewo.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/banonosujalukabemivudevem.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/65558803021.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/sofaturizosoj.pdfIn PDF document text
    • http://in24g.com/upload/file/68216509599.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/zalukabupejer.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133211d9f4b0---76137435036.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/motowuxulukepanuxajam.pdfIn PDF document text
    • https://simbotour.ro/ckfinder/userfiles/files/60231837173.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/79185818096.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/topamexuwupewoduvase.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/85616110192.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27D 17704 bytes
SHA-256: a738ee36085bd005b9e3118e15c17deadca4e53545dc8b600c2208cd48eeee00
font_01_sfnt_off0000e068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 11048 bytes
SHA-256: d7b545dc2c1cfc1286d63cebae8ac53e55c552d927bf220aa9b1931170d627ab

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