Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46913fc5a69bbe7…

MALICIOUS

PDF

86.7 KB Created: 2021-08-05 22:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 387876a176208669d0cb3a749dec2f85 SHA-1: 68893b56535e0fcdae959baa4a43c1fa3745eab4 SHA-256: c46913fc5a69bbe7862c2150ba6495fd8bd3acb057736534ed4ad270abe2b551
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating a deliberate attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e892f1fb657af0915522e85dfff0c1e3/ninatiwukojudazupuba.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707f027074a---36240170697.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/39401060982.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021060517292746.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/58d00c648431f02eabc89372b1366c46/jukinojamalej.pdfIn PDF document text
    • http://prosquash.by/data/3738171104.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/642a401d80c80678081d11826bb5994a/8754869007.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/82748708516.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/95784522570.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/zizaxot.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/25900309810.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/261uhahc1g2gd3dqoucqtgbljl/revutumubowaperopabixur.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/bb9d91ba1c17578229025d06a20f2cf9/janame.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/drgfflu05cdrgks2h3vhso1hvc/90535533607.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/votume.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075e71d72d88---zudoduwosurafusiruwajad.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c5cf2ad82---mufom.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/drp8k0ckeobm7820d11huhrs94/17467284034.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/jozesawunawutobe.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e780c99d---josegonepiwono.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/68865611655.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/9trbcbti6pr12l23jfaf956do7/93074636002.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/mexugixawimupigifonov.pdfIn PDF document text
    • https://wita.lt/images/files/tivagikuvow.pdfIn PDF document text
    • http://elskenecologie.nl/files/likexapiwexutevezud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+reset+crux+air+fryerPDF link annotation
    • 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_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 17096 bytes
SHA-256: d639cab328d910aecd292bc6ce8aef5bcd943fcd0f5d764afc1b004dae08b8f2
font_02_sfnt_off00013426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13426 10572 bytes
SHA-256: 46f6a887eebe7d07718454d576b0bcb6a03119b0d3ced00bd8592fe7a2c5621e

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