Malicious PDF — malware analysis report

Static analysis result for SHA-256 880e51e2f53899ef…

MALICIOUS

PDF

86.3 KB Created: 2021-09-07 07:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc94e7eabc4a77baae6e4d0911e0daa9 SHA-1: 095e7f1b84c4424c3a895db9ae37246e264c14c7 SHA-256: 880e51e2f53899ef3270f3c9b367cdd528f5731fbc4fb4c230b4d0812ebda372
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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://irlanc.ru/uplcv?utm_term=future+simple+fran%C3%A7ais+pdf
    • http://nacyc.jp/Upload/file/vafuwuke.pdf
    • https://vsetinrally.cz/userfiles/file/nobatepisoligexedalavawo.pdf
    • https://akanaymatbaa.com/calisma2/files/uploads/8402736050.pdf
    • http://bitite.lv/media/txt/122/file/xalapelabo.pdf
    • http://chronicles.ae/userfiles/files/talakenisuxix.pdf
    • http://hexindechem.com/upload/files/kowawolite.pdf
    • http://makassitools.com/userfiles/file///94694099014.pdf
    • http://phuwangnam.com/user_file/file/bafuremukijube.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/551d64ca9179433b5dbacd7cbbac97eb/57778749294.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ebf318e3a681086830eb7f803240637b/wobazejizilojajitojezosiv.pdf
    • https://niagarablock.com/application/webroot/userfiles/file/madudaluritol.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/03e0aaf8b7e118420f2110126b9f3d83/kedidilipobetamom.pdf
    • https://www.winsum.frl/ckfinder/userfiles/files/luzimunemokepudinukofave.pdf
    • http://ramz-alqassim.com/Files/files/92154290181.pdf
    • http://www.awakohchang.com/image/upload/File/9749835810.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1c46fd12963a07e51db3272c2289e9c8/lagevudejegexuwovigevinov.pdf
    • https://danielstrehlau.com/userfiles/file/35712508385.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f151a0615---83287605130.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f96376467da---70798120069.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b08d10105bd---2421013730.pdf
    • http://leaguengn.com/userfiles/file///xefewi.pdf
    • http://greenvisioninternational.gm/userfiles/file/5658406660.pdf
    • https://folklorebridge.eu/uploads/pictures/files/66796784230.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/1h6ogmbeinn8mp5qs52cavv160/kewuwul.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcf98261a2---doxosonozusanowelo.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb1c47c808---53032791685.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/a546bb5020db9cefd38d8e195e16ed59/88744269363.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c1.bin
3f48b66b2a7caac953f900f4de71d10f592c5620a6a5bfbc652f16dc9ee69862
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 10812 bytes
font_01_sfnt_off0000fc9e.bin
1dccb63fa44ac85f85da8aa43e00c75d184d907c6f39368f22782890cfb87f6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 20164 bytes
font_02_sfnt_off00013164.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13164 16792 bytes