Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3b9b2d244a2814…

MALICIOUS

PDF

85.5 KB Created: 2021-07-27 20:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10e6a73ed13b0f32914b74d55f6eaaa7 SHA-1: 0354e54db0ec8fdc9f2eca9aa5c7966bc8d58311 SHA-256: 9c3b9b2d244a28144445aeaddf26225d8f8fd53ebaf19e0798164edaeca70db6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or callback scam. The document body is heavily obfuscated, but heuristic analysis indicates it functions as a link farm and a callback lure, prompting users to call a phone number for support or billing issues. The embedded URLs point to various compromised websites hosting PDF files, suggesting a multi-stage attack or a distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://dalboncostruzioni.it/userfiles/files/78615690456.pdf In PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/fazebazuzikuxuf.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/vufosoxafolupesoz.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f63ac981775bd29712cc1011aeb6365b/ruxifuw.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/p1mfuj9eeqj935ir7ifhs01su6/70254759995.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/7f491c353ae85b5ea479a9ff5541c543/vofutogedoxatitosadatagal.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210713191237.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/k3c684582gf754hggtlmq5mmmd/8646886282.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/rf5ht8c9ls2nui09l6jbvh8vbh/60997132574.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/278345cop174kham37fco1gare/wutovezaxalutuw.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/m22v9ceri72piv2bvt1ggsamm3/gimixexelukedat.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e94971f157e75e622c755d6fa1bb3581/kozegorev.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/38795329265.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2a34e4fc5284a3b2dc943d2d8c10587/54930119109.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cb585e1fa---wadukufepolutufeg.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160724053c64f4---dirugujolapamufigutemop.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094251912da8---69318313210.pdfIn PDF document text
    • https://edusfera.pl/upload/file/wamidokivagevake.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/574885a7f04ffe250697f5a3ab2dafff/83078856814.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160beb8f8da3aa---26646294542.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade28be4460---13309147719.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7373318b1---vizenuvepoj.pdfIn PDF document text
    • https://luminex.pl/upload/file/limukago.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/925e827524d5ec5cd5357004d5af67c2/degunurojejotomaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=where+is+the+mog+station+ffxivPDF 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_off0000ea2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2A 17168 bytes
SHA-256: 953760ccb72f0727ab9c6364e55ab808724155098ac52ade8ba88fca7a578d4e
font_01_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 10776 bytes
SHA-256: d2cd9269b79590f4696c34a3df7d9748687237733ab539bfa1115aac9137b756
font_02_sfnt_off00012fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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