Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5167d30fbf566d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 15:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 437ab133981b6cfee8836d44c438d3d1 SHA-1: 3811e2a82b1d4b5939843033284170d1ffcc6161 SHA-256: 2d5167d30fbf566de03dbbe676d8d36f0d47a88f6dd2246097999cff49abffcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://icltindia.in/userfiles/file/vewotizabasipunutajurer.pdf In PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f3e6fe2f23---mazuvuxawarekewijesas.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/kofojijomizabipoxa.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/31762105905.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/69906616003.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/iu0m7o07g33ludt57qrdnmvcs5/53363219792.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/figanaguwuzowizoxazakuv.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/oueb2fubgbgvs14decl58jfhkj/wasazavanix.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/bexajakenaleveka.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/31455561886.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mhb7qc80lsl6tohrvif24hp5q4/xamogokivu.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/lobopopuwovozo.pdfIn PDF document text
    • https://limsurdua.com/contents/files/92642718747.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/47459456302.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/0c0dbef0de538788e5cf0d7800a44317/75368638976.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/gitepugogonuvibifimo.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/41f0cf651e963e69ac478cddb763cda3/31749117770.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5e0db279613607d8f71a44ac7fb69d56/bazoxiwifuvesajevix.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/a6ecd9b75a75fe58a5ecf66f09440637/31015643573.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/47811866712.pdfIn PDF document text
    • https://protrialse.eu/files/files/36387450574.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b56f8072ac8---keruridizipekewe.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160975d87268d1---26857062503.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/93235c51d8a05e1778681b41e5f6dce1.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/lasirerumapajoviwexel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=spatialite+tutorial+pdfPDF 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_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 17420 bytes
SHA-256: 37b0a273d5cf099d097cc7cddd7aff0a0f6303e40a92fcccb2b2d258801adaa5
font_01_sfnt_off00010ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 10396 bytes
SHA-256: 4fce565c3f4009e5e437d2af049cec718282bf1ff2eb63285f6d821198a823a4
font_02_sfnt_off00012292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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