Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb310951fa3330c…

MALICIOUS

PDF

121.3 KB Created: 2021-09-01 12:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d002d4aae82edbffff75699f322cc15 SHA-1: d17c8dc360e885ff3c95873120da6601c173ce14 SHA-256: 0cb310951fa3330cfaae8bcbb25cacf56cb928c1db562ca1dbb5bdf277478ac5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, indicated by the presence of a link farm pointing to compromised WordPress sites. The embedded JavaScript stream, although not fully analyzed due to its potential obfuscation, likely contributes to the malicious functionality by initiating downloads or redirects. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8566b83d7---romaloxulugigule.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/534cd15486230e716ee4082492a67d5f/palonulerelorer.pdf
    • http://satthachkhe.vn/image/file/garupelozonegos.pdf
    • https://kodcomputers.ro/2664/uploads/fodamawabu.pdf
    • http://startmatbaa.com/userfiles/file/44868712524.pdf
    • https://dycmc.com/DATA/upload/files/202108111944207257.pdf
    • http://mayepnuocmia.vn/data/ckfinder/files/83261201509.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/df52c04b31cca8686f16fb0eb4157fd6/38112141112.pdf
    • http://centronegozi.com/public/jawuxanunedago.pdf
    • http://savages.lu/imagesRTE/files/55065467442.pdf
    • http://pamat.ro/UserFiles/file/45704703143.pdf
    • http://acrclubinversores.com/files/galeria/files/nagufenewedulalotinu.pdf
    • http://daltan.hu/userfiles/file/93738003212.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/bov3vf7ahf29v3muhqggbgotiu/zepiporosaja.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/dowit.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160be4a9fa1e9a---47240779487.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/0b7aa4174db26ef29f5cee2845e44caa/bezemulotogemi.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a526170f85d---89520495073.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/db873ceb3c73babbec4f87224890d941/62834168010.pdf
    • http://pazzo.jp/js/upload/files/34408539776.pdf
    • http://copingconversations.com/userfiles/file/51558835032.pdf
    • http://originalcheck.it/public/img_admin/file///8647069866.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7c5b3dce2b9abd9602e0e4f148c244ba/3557512048.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=blued+gay+chat
    • 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_off0001732e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1732E 16792 bytes
font_01_sfnt_off00018b40.bin
e15024a0758481f3c8a144f7c557be72064768d34f11e0d7fb642f00314dea04
pdf-font-stream PDF embedded font (sfnt) at offset 0x18B40 19892 bytes
font_02_sfnt_off0001bf85.bin
f154eaaeff25cf5493e2a0fbaa04433828c1864f91f1050e01729e97a7acdbfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF85 10332 bytes