Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffc297983af34c4…

MALICIOUS

PDF

94.0 KB Created: 2021-08-07 04:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc15bdafcbeb6bf7f6facad28c670eb3 SHA-1: ff43be4d6cf9695a59d0d89dbcca4eb3adf70898 SHA-256: 4ffc297983af34c4bc9537b45a82185bfca97e5de3716b819ad831e1a45b5881
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. Numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, suggest a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a link farm, with no discernible document body content, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=convexity+of+a+bond+equation PDF link annotation
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092432280e1b---megadixix.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/minuxide.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/1806275348.pdfIn PDF document text
    • http://erictex.com/ufiles/files/37813371357.pdfIn PDF document text
    • http://ccsl.asia/files/kexizemotizezatipuros.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743a373cc77---wulaxifekiruri.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/loragapodojuvepebikufupet.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/24499503470.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a699c5ea78e---zigafobozopibutazev.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/wesenus.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/mezagifugamofobixipuxeze.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/dqaakev2fqc3n9k0cuia0u7765/95076643488.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0328e8d23---76337623702.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/58304076254.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3cf8c3285002b16010e0e3bdd90f6d45/77128563569.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//58659098669.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077f5ff404a7---zivalitanawimurakibuk.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/93474692888.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/20807508649.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/dofurune.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c076c526f1c---44781348059.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7d82fd77---6775262146.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2069a63d93---75567617063.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe00136bcd---bosopelamefepatot.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_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 10732 bytes
SHA-256: f70e416eb34dba72004c5b24e6ea19b904646f4e855f601c7b1b432fef1bcb92
font_01_sfnt_off0001204e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13860 18280 bytes
SHA-256: 52abbdcbf2e8e86bd94232be0e366444691a73bef0cb3ba66d55af8650cec910

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