Malicious PDF — malware analysis report

Static analysis result for SHA-256 92fa615c776f9aeb…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 12:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62b1a209e8817bab8d1111a9eb5471b1 SHA-1: d8cac65afea1d78e6a056098557a1b95ed7c1179 SHA-256: 92fa615c776f9aeb700df3c2e3d631d597a918632502f5d19f178511b78166db
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=security+analysis+by+benjamin+graham+free+pdf+download
    • http://clair-environnement.eu/catalogue_dynamique/file/zevifunof.pdf
    • https://picinterior.com/ckfinder/userfiles/files/99693314644.pdf
    • http://asijskepotraviny.cz/files/file/jeranad.pdf
    • http://nfraccon.org/userfiles/file/fuvupidepogoj.pdf
    • http://asckhn.com/acskhn/userfiles/file/23816257092.pdf
    • http://dh-cell.net/ckfinder/userfiles/files/dubasevebu.pdf
    • http://enidental.com/userfiles/file/20210810040709.pdf
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/20004341672.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c900001a426---19224080461.pdf
    • http://dierenwinkelindex.nl/images/uploads/58662478176.pdf
    • http://nyett.hk/uploads/news/files/48592038109.pdf
    • http://snap-drone.com/userfiles/file/bojetonum.pdf
    • http://rocb-ap.org/file_media/file_image/file/31662594132.pdf
    • https://fotokeramika.bg/userfiles/file/mugopejabaxere.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/31e1c98925f3bae371e8e6e968f67941/xigatu.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be3c30524---6956557601.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ec018ec7ac34469bde0720421030e927/83531191579.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/579c5eb9311b3c179167c4a6dcdb988d/98890805211.pdf
    • https://norservis.info/files/files/82411796050.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078338c5d4d6---34710055580.pdf
    • http://uptownfallschurch.com/uploads/files/23666764630.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaebe5daa9---8725198774.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6ff971ed4---livabogimaxixobepa.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_off0000da69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA69 16792 bytes
font_01_sfnt_off0000f27b.bin
1b23351412a56f2f8c81e0174715739080e2bea5695963376c25d01a1b332a47
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 18844 bytes
font_02_sfnt_off000123f3.bin
5d175780b85ef470a20379b5fea6716058921faf6537f94ef5701a740607a9f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x123F3 11712 bytes