Malicious PDF — malware analysis report

Static analysis result for SHA-256 259d81060e4a788e…

MALICIOUS

PDF

81.7 KB Created: 2021-07-02 04:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99fa001846851db982740318320f83b7 SHA-1: 64271fa5ef1501773b8d8194f0a3666d7cd3eb4c SHA-256: 259d81060e4a788ed0be1f2bb125d0345196dc75480424ec317103126f4191d2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple domains, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting users via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/485be761a4f87c1ed925ca5ad030083b/wowixoko.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9e5f5e12788645b2aca05593adce1b6d/sunefekafosafijaruwop.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160718981730cf---jefomadilewoxifakiviragip.pdf
    • http://geose.ru/userfiles/file/76652492640.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609323c79b98d---wifune.pdf
    • http://bakoca.hu/files/file/feramitaf.pdf
    • https://motelandratecuci.ro/userfiles/file/votel.pdf
    • https://akapacha.com/userfiles/file/41405448383.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/78045616207.pdf
    • http://brilspa.ro/userfiles/file///91659118522.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7818c477d---basuzadifexuvino.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1e6355cb---40862889529.pdf
    • http://esthebel.de/userfiles/file/12178957588.pdf
    • http://imailbox.nl/images/uploadedimages/file/34001576983.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d557cc000c---besubalolox.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa09c15b43---28850108847.pdf
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210614_BA41309C4F2CF4C8.pdf
    • http://mwflower.com/upimagesfile///fugitatovaxejiribogaro.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/165254e356f88c020a4da5f478dd7f15/98190782162.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/bn0q8tnna43tlh8m0i4jollge8/88412225126.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/fd6a352ba9e558ebd8285b60e5bc91bd/labegaxupalo.pdf
    • https://hagepoorter.be/files/files/zabekowupupuzatif.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021621851195172.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba91e006f42---76977456134.pdf
    • https://666666.vn/upload/fck/file/femuxezok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=made+easy+ese+gs+notes+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_off0000d84c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 16792 bytes
font_01_sfnt_off0000f05e.bin
829593f723886d442aa6fcf5ff8f211aeac94b025d6c7a616f1fb2b85fc4f89c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 18052 bytes
font_02_sfnt_off0001201c.bin
7cbd3c8b25f0fd239a93376370e4689f5de1c58f5d004afe55bf18bf8e59d741
pdf-font-stream PDF embedded font (sfnt) at offset 0x1201C 10544 bytes