Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e81986f4b93bedc…

MALICIOUS

PDF

67.4 KB Created: 2021-09-18 07:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d99a99e12d7aebe74a6b0917d5f5edd6 SHA-1: 337b6a85066a8e1d3ef55319441b648f6e43afe6 SHA-256: 1e81986f4b93bedca8c32ca67ebf7dfa83e371ac85a6f15c0db97a9ac6b42054
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document designed as a lure, containing a clickable action that directs users to external URLs. Several heuristics indicate the document is part of a link farm hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://huntic.ru/uplcv?utm_term=labeled+cardiac+muscle+tissue PDF link annotation
    • http://xn--dlek-5qa.com/admin/UserFiles/file/23861200902.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/dajaru.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/18193549715.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/ratezovukirolinalunix.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/86564307906.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/78475285708.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/gumekawavefap.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/42769580935.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/28679669454.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/wimemufigapejodevepimix.pdfIn PDF document text
    • http://kdekdyjak.cz/data/96694558702.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e38f9486d0---gaxejozame.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/62765398676.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139c9e83d319---82480650936.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/virimapogelezupevugopu.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/32394958493.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/39956415487.pdfIn PDF document text
    • http://hanleyresources.com/images/77735480612.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/3747dd66e3fba36e90e319b4b249018c/20932427692.pdfIn PDF document text
    • https://agermag.ro/mm/file/filujulanoxewe.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/buralobigu.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/82570642347.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/laxerep.pdfIn PDF document text
    • 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_off0000adb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB3 10504 bytes
SHA-256: 05a9940b492085989db525605bc38b5edf51adce9a062a4e105159ad0bd0c7fd
font_01_sfnt_off0000c599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 14008 bytes
SHA-256: 83a2d4ec3d4d35f31c341fe37e6fb8a96a2a773ce3e68a8401445ced2595e865

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