Malicious PDF — malware analysis report

Static analysis result for SHA-256 a464b6c326668125…

MALICIOUS

PDF

77.1 KB Created: 2021-09-03 02:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fbe68bc127f63b6c4d4f7cb4a6c38afa SHA-1: f8c2f4c554de1f2a9b227d29eb9707ef65109ef5 SHA-256: a464b6c32666812522b69d0ba97cd9eef6ef05526001457c383313d968a6ee84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/37873d20a2551f10846fde61a8cd7d0a/55602432798.pdf In PDF document text
    • https://magerp.org/upload/files/86578815509.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/26005163754.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/nijisifemoruluko.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/55551161386.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/93028583685.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/duwulikugifavawumijazer.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/60501156752.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/jirozoronu.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/71302592486.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/nti0uoju5hgttp6ibnugf29ssl/32043922077.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/35400216270.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/rizufukitopek.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/44271786675.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/xibepupipifobogazitaduku.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3d331051e---telinelotakuduzemetudofo.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/7b999c386e1beb67efcdef5ce471bc69/83610626199.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/4504611613.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a273560b3af---savazegupejamipadew.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/naomfuo62uuqt3j2un56tltds0/vilopav.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/13633230442.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071b460bca13---gofisizelabotomijenolibol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ap+polycet+syllabus+2019+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_off0000c864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC864 11116 bytes
SHA-256: 822e583aefecff90245232266a3e5d076faa6636f10762462ded8b11f9bf6b42
font_01_sfnt_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 17312 bytes
SHA-256: 095af99b4ef80d9a890664678d26c4c676f075353ecd781d7d4f52bdc263593b
font_02_sfnt_off00010f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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