Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfadf875b37b1e1…

MALICIOUS

PDF

96.5 KB Created: 2021-09-06 17:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25c8033f3a8a60fc57e6476559234a6e SHA-1: 88bcf54a79d9413132d5bb49afcee79a33f7827a SHA-256: 9cfadf875b37b1e192866efa00e3098468b311b79708bfb030e36d196d1b140b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://smidgel.ru/uplcv?utm_term=instant+english+handbook+pdf PDF link annotation
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/253co4b1gfvs00ukfril0t6gsv/fareni.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0221dccf70---terukud.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/fegef.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bb461f20e---65084175515.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c506a265583---didasofoduvudozedono.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/korezovenunizuzudef.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c4d8ff1aafbaf496c0788cc432d3bf0f/28706150507.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/wuwefenufu.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/paxanabemekipu.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/pujopul.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090c06457249---duvidunuziloxikifugog.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/76979896258.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/4022683401.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/fadupur.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/zirire.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/wufogenow.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/1826709812.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/jepomozijak.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/nakod.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/rum10mveruo5hcflio2bvt8ogd/37287004485.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/futogebag.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/zikezenewileg.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609190cd28333---71991603957.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_off000110c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E0 10860 bytes
SHA-256: 11dc875d7fdf36b490b0f4915bebfa1aa81dcd0b05a3e5039dbfd53442f0b077
font_02_sfnt_off00014169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14169 19000 bytes
SHA-256: 65906f6928ea5387c0e03b99002faf6249272f6deeb344094b120a8e64dddc3b

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