Malicious PDF — malware analysis report

Static analysis result for SHA-256 933a5f7ef97624af…

MALICIOUS

PDF

74.3 KB Created: 2021-09-09 04:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4ba5b17d9e3f8d1fe9ac4dc597b42ed SHA-1: 2ea68562cbce3209f29def1f80cff031284c4693 SHA-256: 933a5f7ef97624afe082e9addc84e530c6b0f238e0aa68304f6c09be680e4811
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0pphkv0de4ni5shh14c35lclr6/13201131890.pdf In PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/81403759102.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/mevibizusi.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/zamimewabis.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e6b515a90---tipeg.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/gfpuc0pagt3hpfa2jde7akcera/vimulumefidugi.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/nopimetu.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/janikixijibaw.pdfIn PDF document text
    • http://jaqalsports.com/files/file/40641158898.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210908071117.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/81761159014.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/kavivakanadevugapitugax.pdfIn PDF document text
    • http://cpils.com/userfiles/file/pukepunin.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/pufegedovenan.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/jovabozovipemijejer.pdfIn PDF document text
    • http://potya.com/lilejuwonezof.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/newobosukunujunav.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/pelekedix.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/vobizememate.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/98047137649.pdfIn PDF document text
    • https://alkoplast.rs/files/fopitolaferon.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/64001485773.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b08ff9985abc84ec76e7881ea880b4c2/dowimususugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=six+pack+photo+editor+onlinePDF 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_off0000c0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B5 10712 bytes
SHA-256: 3e0fe35f40947e724a61208a147d41202f211b162caa7aa0a86489c0ef21dc16
font_01_sfnt_off0000d941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 16368 bytes
SHA-256: 67fcd259c266d9719efb9e213ea97bbef3e6ae9bea068a4bc8a00e340af8e613
font_02_sfnt_off0001036e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1