Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a40073591a2e58…

MALICIOUS

PDF

88.8 KB Created: 2021-09-07 04:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e77c6a9a06d33169649e4059a91cb66c SHA-1: abaeef9bc72222892a5a169cfb51efa2dfee76d4 SHA-256: b3a40073591a2e58e519882a157f588501596a66a11a1b615e62fd3b179d14bb
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, forming a link farm. The primary function appears to be redirecting users through these links, likely to a phishing page or a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://bmsorganica.com/userfiles/file/36061982690.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/bf3b74129d24607cd4c36fbe1edc6c07/10961795989.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/wedomududakofud.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/21822884895.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/fasepaloxularadonovilufa.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/xapekab.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210730_071001.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/37213136256.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609600b57c01e---48758059831.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/67adbe0b5ae4f18fdb2fcb4343c3d873/13555994205.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/22845f60dcab2253fe8d60c5fda3b964/83947581223.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/61992151128.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/piwupivuxopefadigedujuzi.pdfIn PDF document text
    • http://ailizia.com/userfiles/narujojofuxenupoj.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/sspavi21a2nf96ivfiaa9qpfil/81646712358.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7528b13a7---12418875046.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/10395829140.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607256bb73d8d---14391024552.pdfIn PDF document text
    • http://join-angel.com/ckfinder/userfiles/files/demulujetulo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830af10343---42695430078.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/pl8st5ga3e9c4q1p2p3imeisie/nanatipipiloteketijawemo.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021063021501280554.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/99284585420.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/99396080010.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/fh39ngb9jbbq1irdgtad4ac9tp/nuzabibanoxujebivefum.pdfIn PDF document text
    • http://voijin.com/userfiles/files/daxez.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2csrtod59oi6slkflemaf98ht2/jopomusebajuxoxifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=soil+nematodes+pdfPDF 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_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001107e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 17156 bytes
SHA-256: 9746bb8fd9cf23be3d69d04f71c27bfd3cdd59ec76f1beed0024967e7285de1f
font_02_sfnt_off00013cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFE 10632 bytes
SHA-256: 451ba80223fb4d0ec6711a2a27d09802e52aae00fe01e7fae268c83000692910