Malicious PDF — malware analysis report

Static analysis result for SHA-256 740b478ffd2863b6…

MALICIOUS

PDF

88.9 KB Created: 2021-09-21 00:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c7c9e6c0c3d58d45bbe4d1d75d69f9e SHA-1: 772ec4a258a7adfaf5f5e74bac9cd8fff7847624 SHA-256: 740b478ffd2863b6c6911f71ab1a541f65e7adbf8594638b347f80af3a106cff
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in phishing and tech-support scams. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://zoncmswebsitebeheer.nl/files/editor/file/givafumaxizilebugijurej.pdf In PDF document text
    • http://ecohort.com/userfiles/files/mamivunazi.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/rugaditabatumated.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b72ac823ec4bc013ebcdeb0b63027d4/luwugubufabutusujizulu.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/65915192874.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/74991138714.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/damumamurinorabilusifus.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/potuwidirakirazeruvi.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/37242017254.pdfIn PDF document text
    • https://lorus.rs/files/14859494424.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/01c6baa3d41fe0bfaffa7415dbf7a9c7/45367766071.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/c838e54055d565a3063a06a031132ef8/xeniwowovagubisozodo.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/63608699034.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/75949393995.pdfIn PDF document text
    • http://redactron.com/userfiles/file/rogemepanorazezufode.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/78854512588.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/23801536013.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/51445962417.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/ganofesenijojomatu.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9991a24f35c00a8e1902ab2b25e83c54/3328033476.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/sirenawepekuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+flash+playerPDF 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_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 17068 bytes
SHA-256: 88734ebf3d2f417e2d069e9b71838a1db7803ab8c5efe39bf9aeb5048570d2cd
font_01_sfnt_off00012648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12648 10592 bytes
SHA-256: b52707ab0db5045fe6f88235b31ded12b92cc6d99e1f377a653817c3bf21a92b
font_02_sfnt_off00013e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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