Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2dd4cf0c00f7be…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 00:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 88ce75fda28b14bd2680be16de56ea7a SHA-1: 865fbf7f8630c86132a534d48a1cfdcfa72b98e5 SHA-256: 5f2dd4cf0c00f7be2f0ff20f5b34c63b532530add4bfc444e60ae3ee58fb60b6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting it's part of a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://imosa.asia/uploads/files/202109181901149987.pdf In PDF document text
    • http://dlzj.net/upload/files/20210903014818713701.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/7307327718.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/30671479958.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/14606233363.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614341e03b00c---91363873295.pdfIn PDF document text
    • http://3m18.com/images/editor/files/vipudufazabokuvipe.pdfIn PDF document text
    • https://polytex.de/sites/default/files/42347406554.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/nezug.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/66039471744.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/funasiwadijewutaren.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/58686892984.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb73ed566---wanaru.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/wuxejowevupune.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/51060444702.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/72231697067.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210914192022.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384923cf606---42522515647.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c2520e5364c78c36222fd6f8eb218a12/4815396998.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8c567f5b2---87619288920.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/novuf.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/mijesukapov.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/tedalo.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/28283846617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mx+player+for+android+tv+apkPDF 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_off0000ca82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA82 10692 bytes
SHA-256: 2c381293506936aec98d2da4320758d8221c2feccb1b996a9c50b55fb0e1c917
font_01_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 20220 bytes
SHA-256: a5c641503a50f02d773a27945c0519026c220a0758d30d5fb3d30a19e610dc3c
font_02_sfnt_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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