Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9124f1d9991026…

MALICIOUS

PDF

91.5 KB Created: 2021-07-16 09:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cb8e8ff3cdf146240d3d1f93557cc693 SHA-1: 6a1efc0fa7714ac30850cd090f27ae95177fabba SHA-256: fd9124f1d999102660df46f451ffe945633f631d94a618cde9c5b79e19d44836
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The file's structure and embedded links suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lucann.com/Upload/file/63026673681.pdf In PDF document text
    • https://betenrealestate.com/sites/default/files/file/35579235683.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/087ebffe2dd2a8a70b171c0f77463f99/86192755502.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/59729737762.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/donowotakef.pdfIn PDF document text
    • http://kokomo1986.com/clients/31029/File/54750979228.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/5t17ppkcmc9q9hsolsefmll5qk/demizorenadaw.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3968ade82343e04b60fa732fb9dfd621/nekataburo.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160babb3bc4a8e---21709411797.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160d529c0a6bf8---silepivupevedaj.pdfIn PDF document text
    • https://congchungnguyenlieu.com/uploads/files/fumevedekelokisarusala.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/98c465825fd96179e1b42a273c06d150/giwodile.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/zitukiv.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/4d16b8366130c62087cbb99cc8588d82/bawipelabafugak.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905ed75114c---namitatepe.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/7252dc69b03f513f61e4affd7e7642c5/wopoxarit.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/sirosozirefaxexi.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/lobutigeporijopilotase.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/nupabiwumizuwewuno.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0f7bdd090---nuwudokenab.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/87493672785.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/49473722456.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084e71cf05cc---56856471275.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/23f8c466ee5555fef73b9b44b2fbe7eb/95648090683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=look+at+me+i+will+never+pass+for+a+perfect+bridePDF 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_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 18212 bytes
SHA-256: ef8f74ebbfd409a7c6d70e8e59d940fdef3617ad77eadad6c531b5980e2c525a
font_01_sfnt_off00012eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAA 11120 bytes
SHA-256: e6df418577663775e9a7b1dbef580c8d8fd873ab97946573c82dbe68a01341bf
font_02_sfnt_off00014875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1