Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f635c5f1730c4c8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 05:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06c969ae3e2e7d0f7fbb73b20a842bfe SHA-1: 2a8315ced97c8214231bdfc6d79c8c965ef7f7c3 SHA-256: 9f635c5f1730c4c851fc113cd0ba21ad5ffdb6db58e7957df5583273166a53a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df88f05110c---kalapuzekul.pdf In PDF document text
    • http://diamondsnspurs.com/clients/12200/File/29411001219.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/18720380378.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/5891b9c0241c7dbf4fde061b8b722e80/lefituxomi.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/62309035989.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/jujomidajawepe.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/wizijiselobug.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86a4d285c---95707845625.pdfIn PDF document text
    • http://cichanski.com/Upload/file/28447595788.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/bujujoligunokusu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160721bdc153bc---zabifugixupejuwugev.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b66794364---4694494914.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/7330bec7e28b3b3e062d609af874c781/xanalunasujorutuliri.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/xinoremuraxuwunipaxanoj.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/77021620165.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062802344311.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/78739808982.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210903_2EF714C150480B10.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/jewugosolekafuweputu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160952a6b2b9f3---87482337005.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/69982334163.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/665c965b0f5a4bfd00bc294fe344c1c6/rujovesumanotezodadariwo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4593d07d35---wirusa.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/d377559e7e2e62eaa6d444e0fa094da3/wurumatapodedibumifexaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=convertir+pdf+en+word+en+lineaPDF 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_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 19200 bytes
SHA-256: e2aa7ea8d258d847d8b43585191c2050eea2384311513ee53f820b0b422e0bca
font_01_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 10508 bytes
SHA-256: d20efd725ab9eb2ac162b9e595ea1b0cb1a61f2465ce4d892cce30eb764f4c00
font_02_sfnt_off000121bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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