Malicious PDF — malware analysis report

Static analysis result for SHA-256 f055a8251bf86765…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 05:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 975bf9b9d2a8ab10fd6e6019110bcdac SHA-1: cb7e761f1fa9e61e4069b5004678a6c4b6dc0707 SHA-256: f055a8251bf867658ac2a39178b36fc81a916b2b0a26dcde9eadc9b9360db61c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous URLs and the PDF structure itself point towards a phishing or malware distribution scheme.

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 https://chcial.ru/uplcv?utm_term=tinkle+pdf+download+free PDF link annotation
    • http://www.nachtruhe.info/up/files/julodabinunikilasonemafuz.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/32975072757.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/20330585280.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dc1b06290---wogofasuxef.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9b1899232---zudamezovunezu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093919c18eba---39441600666.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb5918928---vavexatabunawifu.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/69924627405.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1a5763f2db6f8dba915f1c03852c037d/nefato.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/13403162814.pdfIn PDF document text
    • https://viehomes.com/upload/files/rijevuwugo.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117150934891---99973675742.pdfIn PDF document text
    • http://kahasat.cz/data/file/bevupako.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57ed32e60---70865590860.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/2747971450.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c67b1b488bd2b79fb6086baee6da8da3/88848293907.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/tugapilimiselujolenewak.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083f6ee861a7---70786894896.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/486380265.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/83122894162.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/81930563883.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/rebafuxud.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/473a8b6933aeee314c1e353926485e8f/witofenezinuzilem.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/41515768218.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_off0000db2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 10364 bytes
SHA-256: 864598cdc78331b3ea3d41d7cf45cce53f595230763982e523c3c059317ab0f3
font_02_sfnt_off00010ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 19400 bytes
SHA-256: ecf974141f64ef11d0c01aec856d3ca1bfe04d02c8683d76e98b3dd0388f42db

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