Malicious PDF — malware analysis report

Static analysis result for SHA-256 736f350d6bdf7252…

MALICIOUS

PDF

84.5 KB Created: 2021-08-10 15:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7fe4f2059d0a833623f9ec73bae09e9 SHA-1: 1a9ed804426e4a24f20565c2ab5243390e48cba6 SHA-256: 736f350d6bdf7252f2531d292b6a3a7b50f9fd68c3706b18cadb07d5aee9fc84
164 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing or malware distribution lure, indicated by the presence of numerous external links, some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links point towards an attempt to trick users into downloading a secondary payload, potentially exploiting client execution vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=how+to+fix+samsung+phone+not+turning+on
    • http://nextgt.eu/uploads/file/51767537373.pdf
    • https://akapacha.com/userfiles/file/44914222627.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/gidatujubikoreruxuraruve.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ab3b3655e---71146849533.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b70088d5c68---56557382146.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608472d7505be---wapudi.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/c429096f3ef7b57a60dca58f1bda82f4/4076068420.pdf
    • https://stef-nancy.fr/upload/document/desipabubibonadure.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/12d045b03c8f68464b96c5ea8a89c1b4/67570142060.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/db6647f71a20ea7851cbc30fa81f1559/84960432755.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96995e50f---25689506695.pdf
    • http://anthonyvienna.com/sites/default/files/file/4473952201.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/lusdsi8k6ua26e7akod2guhro1/gojokilozasujuwisamobobop.pdf
    • http://genbreedpublisher.com/files/upfiles/file/febomibapuxalumomemop.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210619020137.pdf
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/fewemuzozovo.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbcbbf261f---10022175592.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160db17b2e6a2b---40952495228.pdf
    • http://pho32shabu.com/uploads/files/68818616798.pdf
    • http://aloeverajuice.cz/files/file/67399806685.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/37c333171d3384d8f8aca2b52e79520c/11598100263.pdf
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/75796772744.pdf
    • http://www.vljainandco.com/userfiles/files/juzemogifomaropixu.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_off0000e78f.bin
7d260b74f265cbafeb9fed61f17f39aa673858c33290ae7cc07af7683ec0da7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 16748 bytes
font_01_sfnt_off00011319.bin
43ea0838f2414b0e8e17d6f209dce2502a0f14a63ca150046909a62c28c4b7cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11319 11036 bytes
font_02_sfnt_off00012ca7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA7 16792 bytes