Malicious PDF — malware analysis report

Static analysis result for SHA-256 650a441b78c61292…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 08:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5fb7a2562ace6b6a965b2dbb6136cea8 SHA-1: a21fc317e6895a41545c150b6682f4a9ef911135 SHA-256: 650a441b78c61292e0dadab83f62a2fc8cee291f86bdcb3b36984bb205f3b6bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://animationcoach.com/userfiles/file/walosizinixekilabamuw.pdf In PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/majp40hh1296vq7ik733ee4oc3/fadirilemuduwusisita.pdfIn PDF document text
    • http://dentherapia.hu/files/file/75603373093.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc2e2034d6---30782920660.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/u86dpcmsl96aq8985koqlko9u4/jolodirapopuxufiganajezas.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210603_A166012444C58293.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16082a31584381---56448228504.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/miwute.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/tetesoluna.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/17996541816.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/28442191994.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/44768145906.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082384c3c122---29806553513.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609272f5267f1---54441950661.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb4c7f02c---36069259678.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/vakufifedanawogidavawade.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/868ffce1ce8c2869b502471e019bf995/84419263275.pdfIn PDF document text
    • https://topaldanang.vn/uploads/image/files/95645823842.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611af19c0c77f---papifopenuvure.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/minewekabajolizovone.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/jesununik.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7237f275d872612c87597b2d47c38a72/44442619099.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/98085728595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=consequences+of+biodiversity+loss+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_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 11048 bytes
SHA-256: 9eb527b4901956e993924b44770fc854ec4e5d710cdfb094b6dea647e2d8a3a3
font_01_sfnt_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 19408 bytes
SHA-256: ca5b9311a0ec6ef13ae8b5192f12a18e99eea5e697fc03b565997ed219c5128a
font_02_sfnt_off00012cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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