Malicious PDF — malware analysis report

Static analysis result for SHA-256 11377d2ba416622f…

MALICIOUS

PDF

89.6 KB Created: 2021-08-06 16:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b1db56c5ce6a2d86b8ca2cfc928d750 SHA-1: f3f99c04983c657ab14289dac21d2ee38305d9bc SHA-256: 11377d2ba416622f95ad2b7e0086584d79a13319e02a3a73ee6c68a51030a926
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the overall structure point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c51ebc9570b---kugowajigotitobomob.pdf In PDF document text
    • http://andrewsexes.org/clients/867461/File/97060715439.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f5e5be23---beguvux.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab14b2b70a---vaxuru.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f3e156e0f7bb1f7ebefb35e877ca2785/runivevuxelelaxawitevew.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f1b69b89e---51079212556.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/80d894a4gn90o4rdc699toln04/43304435846.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160906f347c0d1---xigesitem.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/115ce4a0c1adf0fda1a4361f182e55e1/wimev.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/18444024036.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/jfrcqnd9k2rns5p784hrogthn1/vevopufijewitawatov.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/16668968203.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/lizixapuk.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7476de7666---rimak.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/2861740265.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/86889ea13b51410ec1ec2ea9b6a19f8a/49986542427.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/16767449337.pdfIn PDF document text
    • https://stopserv.ru/files/file/rexuwob.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/3qp5dtahaj30nd5tjt5bg3a8mr/powebimasolirinekepud.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/3402660faec4c9f2f2effb1bfaaec58e/xanozuzibolin.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d960bab533df20b2ed4a3fc037498e99/16822877708.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc80b2cc47---95005518814.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/bosidivirilanirufitonake.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/88121331741.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/lurefaxuramosaremuto.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/13360828576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+determine+degree+of+financial+leveragePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 17356 bytes
SHA-256: 88596adecfdf9b83df70c86e736164d392b75c5224bbc2ec0c79624e54f31b7a
font_01_sfnt_off0001269e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269E 10796 bytes
SHA-256: 13ab723b9b0543fdc58758b6d58e6126479db930dde4188d264e1f88f6fa826e
font_02_sfnt_off00013f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1