Malicious PDF — malware analysis report

Static analysis result for SHA-256 efaee1d859154514…

MALICIOUS

PDF

88.2 KB Created: 2021-07-10 08:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 742a710a254186d084559fd1c22efba9 SHA-1: a949fb3127f7f88a4b60e97e76ec41ef0b0794b8 SHA-256: efaee1d8591545146f565b7c68d5f843316ac7e343770236d346e5737478f48a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ketchas.ru/uplcv?utm_term=timber+ceiling+joist+span+tables
    • http://zetrade.cz/userfiles/file/kokorulaj.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090d6a4c70ef---xatogulaseregubuwodurok.pdf
    • http://adamlegal.com/userfiles/file/mijufanazisudurikeju.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4986aea69246f7137f8be7a4c7de89cc/89476621231.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3de49e7df9---virebuvifizimebokabow.pdf
    • https://cakenepal.com/userfiles/file/9522032383.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3bd789907---5027229706.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/kkg3od4jp1pkko3ifschdi1i31/88081206710.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dcn20h2otn0at8s33lu35rlr57/22169421443.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c10f858b10---14936467486.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072045033cc5---75594242125.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4ea309da0---fuzew.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81a9767d6d2391e1907e973c8f7fbd36/51272214784.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a28b7210cbf---zugobugakixotodubikapinir.pdf
    • https://designclarf.it/file/libadagojejopemewa.pdf
    • http://dansensvenner.dk/imagesfile///zetetatawamubaguperizalo.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/gufunanewuzigewagabimono.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c9e63b8fc8cfec1dfe789c86ccd8dba2/bipif.pdf
    • http://vnationwide.com/userfiles/files/sogerido.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b29a2ab92e9---62457750601.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/49494bd9e68194aa08d976e7609f6592/zunovo.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/oh00054kos0tbl14b54m0sa18b/70810120843.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dffc930566---36386370383.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d2013ee6c---pumanuzofon.pdf
    • http://ondrejkocar.cz/img/file/55222829033.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607282948f13f---tudoduxif.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_off0000f57f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 16792 bytes
font_01_sfnt_off00010d91.bin
dd53e48068d69770fb7dcf89614fbc35e5a4ccc801e9a20a59740d4ac5e73b76
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 17104 bytes
font_02_sfnt_off00013a60.bin
2df9f2f6cf8b0bf128992c6c69790cc319f2086ed8c0ab6065bd1075a2478658
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A60 10952 bytes