Malicious PDF — malware analysis report

Static analysis result for SHA-256 5261415ec4ce40fb…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 05:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4f4c31cb47521535042594ade6d64ac SHA-1: e55a8e8179a4e54192316aafbdbd09c2042d491b SHA-256: 5261415ec4ce40fb02916b5cd89f0296398b558e10cc8fc2624fc3312697492f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised or disposable domains. The presence of JavaScript actions suggests potential for further malicious activity, such as redirecting users to phishing sites or initiating downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=good+movie+streaming+websites PDF link annotation
    • http://tbvshungviet.com/upload/files/66552351307.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/1129743718.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/91974444924.pdfIn PDF document text
    • http://aimic.com/userfiles/file/71568000502.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/86741264222.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/jijor.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/1400277340.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/pelefalekubudevizij.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161468930a2fe8---pumakow.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/29238d028159c8688617efeaca9840a2/75004490441.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/42997824822.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/rusivowubisixa.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/tupugepenoja.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/93303201737.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/wadomakezidulabubax.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/80609977069.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/35953215845.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210913_095037.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/ludezisulaviwevufidalesof.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7e5a36ad36c463bcdb97e6fd690d3554/niwolabizamofegekixomor.pdfIn PDF document text
    • https://eslms.com/userfiles/file/83473030873.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/69021589070.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/xuxazave.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_off0000d6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C8 17300 bytes
SHA-256: d840157692fd748cb61b4e6c2ffb6407d39e8714ad366e244a296cf3a7cb8341
font_01_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1E 10876 bytes
SHA-256: aeb57504b9dc7c64578e462d6101ce6ddf2a1f7187d157bc74cedc2732b69937

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