Malicious PDF — malware analysis report

Static analysis result for SHA-256 29782ae426d62844…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 07:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 028164cbf529217615d169eed9f48459 SHA-1: 1ec2cfac739f1c413cba91b248e0a3b5413cde33 SHA-256: 29782ae426d62844e7bf405696b0a4b436af041abdd9edae7ad45762d5ecc031
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple external URLs, some of which host further PDFs. This pattern is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/08aa70e2f553e437ac70865ff5afd178/36122747482.pdf In PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/gamanozixi.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/tj3so14j64v7ppe21pq9nblj28/muribakina.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a5cc1461e---wajerufanum.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/88224669694.pdfIn PDF document text
    • http://beiks.info/public/file/fonara.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/22016337788.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/90074780056.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/48530406623.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/kenogezigasoxewaxejuw.pdfIn PDF document text
    • http://vodova51-53.cz/files/76631636624.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/nafopenomezi.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/60340461527.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/neromokavubujo.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/54575702059.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/66835569936.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/18178202547.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/mupemasinejivetajapo.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abcdd025d92---genozasaluxijazo.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f6ca2dd12df2f55760ba31f5fb233857/junem.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b462737c2da---38984330200.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/6107855832.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161290a251162b---29534162168.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/40349741050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=emotions+and+essential+oils+8th+editionPDF 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_off0000c1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F6 16684 bytes
SHA-256: 606794ab32cd9891725cee2ef174212b2f455f840fe3a86b1a4b25645572cec8
font_01_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 10604 bytes
SHA-256: 6204b131288478e42e54a10197b09b8779f6d8a043e624a44103de310c66456b

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