Malicious PDF — malware analysis report

Static analysis result for SHA-256 321289e0b480cdb2…

MALICIOUS

PDF

117.4 KB Created: 2021-06-30 08:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e488343c7d010c7b8561746940f0a8cf SHA-1: 5e402f9605ff47af5d41e71987bf23dab28ee488 SHA-256: 321289e0b480cdb25eca894466a24630c7af59b8827db69d8245d7597556d99e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document's structure and embedded URLs suggest it functions as a link farm, potentially leading to further malicious content or phishing sites. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a fraudulent phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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) or Microsoft license-boilerplate 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 https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/g5f3h65euciqu94gt5ja49clmf/gebemimagokoj.pdf In PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/96727147513.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a716e62a529---tifadi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd59a8fe61---numibovetuja.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/62ohk733riu8gkqd8ljeagq7p1/99384003877.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/652e3ca074de96d21acb085ed006e9b1/dirasebedibufoputunu.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/48148038069.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd69071e5---jutapugopekatojera.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/6ad544c9c322cbce1477befd6e534867/6773067823.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/jupulanitilotanadisifafov.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/74622720431.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/5c11f5ce78e50ac10f130596b6c0f5fa/41801253232.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/dekarakiduneluwureso.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/lalodogutawujedaxufa.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/e1e4db11339997bd64daa2f007c23edc/90988547717.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c65ea701e75---sunitozogutexiz.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/78100976314.pdfIn PDF document text
    • http://araonline.hu/uploads/file/wilemofalit.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/72256077123.pdfIn PDF document text
    • https://alutat.com/data/file/zilugudepetewaneji.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/genog.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/7dcf92f3bd35bfe4ece587a065aa0d2b/38675439373.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5han5dbj1btu0qabnn5it000t8/jibegarekefu.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/29429af0a10f1d5bbbd33346371ec77c/pizojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=12th+botany+book+back+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000168f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168F0 16936 bytes
SHA-256: 26b4bcf7f35dea5c73ce90f021e12b7e7db3626e0eef5ad425436c519845596b
font_01_sfnt_off00019548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ad5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD5F 10696 bytes
SHA-256: c7afdf634c9126634e8a5c140759f62afc04d17577d7fed4896a6d39cd35454a

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