Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f95d2cc76ab67ba…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 19:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b92fb68cb257887c65bd10a28dc2528e SHA-1: ee18cb5ec634e583045ed159578462875970df0b SHA-256: 9f95d2cc76ab67bab4c9e0fc5d141b083632d279da6f9d844c4e22a8aa69925b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/831bfa749f15549874a88106c8d75a92/posusugexave.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gpveg21anl62p3fisiq0i182qq/wofegakegatal.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be882ed33eb---pojusokakuxan.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4f3166b5643ed203c5e0acb0f00ec726/77959197556.pdf
    • http://biurod9.pl/public/userfiles/file/nukukupixibujuxet.pdf
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/1bcc395616ff7cd77a6c688221254946/roluvamili.pdf
    • http://esipro.fr/userfiles/file/27149674664.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0in86sslj7ohc3ofag3ugilasg/92236909433.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c567258d712---zofixedijomitameboxoda.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16092d5438bc46---92485467470.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ip6khggpo6qv4qvbbrhaioron1/97422842481.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/ca6a0718b3a2e6f1a64e63817f4ef517/zifigilidobepotelomu.pdf
    • https://aquafilling.com/userfiles/file/11409178974.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ba753913dcf---tonubewo.pdf
    • https://ventadeterrenosurbanos.com/userfiles/file/remepodukupubezeluvanu.pdf
    • http://spc1991.com/ckfinder/userfiles/files/natepakabiguf.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983927ee491---97647932250.pdf
    • http://abnicum.com/files/file/45542044548.pdf
    • http://pomocnaukowa.net/Upload/file/51689713858.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/pvnfus1sjlabta353cbu543mvo/munurixomi.pdf
    • http://massimomoroni.it/userfiles/files/luvatujebiwuxufotokif.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be42871a59f---68036449146.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/a873ba2133c70ddcee24d9b2f5cbc2c3/gekejigori.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6486dcb6d1---25179559029.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712fdebde07---fiwoludexen.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gold+value+in+nepal+today
    • 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_off0000ed7a.bin
084c40b76e3477447ccdf9553b8b51e16a06caaf052f7e983b9d4d387805015e
pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 10436 bytes
font_01_sfnt_off0001053e.bin
c59faa4a9d8a43876666b8bda80049193d2ac6617c647f59acf0fd9412167108
pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 18068 bytes
font_02_sfnt_off000134bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134BF 16792 bytes