Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc606d3f9306c941…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 02:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4e58ceaa6d7a8dc54040b073c0e2f313 SHA-1: 796e87cc90c535af3772aa828826dd4070f68535 SHA-256: fc606d3f9306c94144b931682e902a42eff153bc12d635d5609537f79c03ea94
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of these links suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://auchli-appenzeller.ch/userfiles/files/koxomegusuzidanasugu.pdf In PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/d9eca982eb3923d4625e971f66b0c1b0/92993069561.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff6478815---muxofekufumogamixipetali.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/pufokeremumofugizafofevom.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/52pc621bv8mfd93ujfu0i4taro/63088692420.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/56395819357.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/3a45c349c63333ab9a574c6ff0184759/toxigesewebegupusoteso.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/83893332855.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/gewojamulo.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/88413971042.pdfIn PDF document text
    • https://clinicscrm.com/img/files/farudexupatojuvifagegudam.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/zasejagukofobaroze.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/dumosi.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a44c3dc053---guxujofo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9f700e23a16a7abc5398b49db4e53caf/81225614599.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ov04a9pooch560phm3mn791ji5/59682584874.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/f4edbd7dbbd052d33bda0bfc56dd665d/33452080634.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/letezuniwogetusilex.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/vejufujimujuwe.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/55579256380.pdfIn PDF document text
    • http://mc-opony.pl/files/file/vogugojebalovitujanixubep.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/gafalomini.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/55996147200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=vicks+personal+steam+inhaler+v1200+manualPDF 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_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 11160 bytes
SHA-256: 92c2ba55ef831a649d525dc637789aafa31c7dfb94f5e467004de248509eb723
font_02_sfnt_off00011672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11672 17556 bytes
SHA-256: 19f4272217f4db14181560b67ae689dcdc39e0a656ffb06cf3427326567b806d