Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c38ac4ba0877555…

MALICIOUS

PDF

82.2 KB Created: 2021-06-29 02:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 857f3e14ba266e287bb5718896f5f33c SHA-1: e2f888df5f36c8699ac0bbb3de98216fd2d9dd0f SHA-256: 0c38ac4ba08775554eedab99bd864c73efecad588953d045a6eb8641d5eabe28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, 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 structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=turnip+for+weight+loss
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4822a1f37---vuropakupekexoxipokukuzem.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8587ded5d2dcf15f0dfc2ef67cb272a/selitukapep.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/88fc3a2089862fd85fd9e42b9ad15930/lirojoluzasoriwo.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/bd0daca061e699c684c783b88d5a8460/mifali.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/hvrj36864318fk8g18u5v7rit0/93047942950.pdf
    • http://championsview.net/userimages/barisizipewaw.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921643e1267---27373335379.pdf
    • http://arci-mp.fr/admin/File/gonefunemonepadikewi.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6cc2d959e---mupipevakamesazovoxidu.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/mukki09hpugn3a9dsnoil6juum/bovawidi.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6fae2b507---5291180932.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a78a26abce---85466614564.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/ec091bdd904e209aabeb2ed0ebc96963/nikemuzu.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48229f264c---43565754396.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8162929cf4---tiriza.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/49a3047124d90aa216065d562aac17ab/tomutapa.pdf
    • https://ibliberia.com/ckfinder/userfiles/files/tejarutabopupexexor.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/jdktk36d7n2504q4d7614pvd3n/63246161194.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/a96a8ed4c043304be9033f0e4aac0dfb/zizezapowiwojokoro.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc270ed5867---nisotixufewowatisisixi.pdf
    • http://nuitsdartistes.eu/images/file/teselafimunavetudavini.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c232eb32c16---44631810028.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/8uul33l21tsalr0pkb6k3hinqv/kozujefededosukag.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608050d5ebf44---1118204144.pdf
    • https://southwestlooms.com/admin/userfiles/files/botijuzakorajarifutub.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_off0000e164.bin
6df2e939d380d1b1debf1a44a3d3458c5c2c6c3d0ca3a3f967e39492ef2a7697
pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 10624 bytes
font_01_sfnt_off0000f9ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 16792 bytes
font_02_sfnt_off000111c0.bin
034f6a214dc224939b9a002a5190e6ae42d4b04cdc6c5126f9e611c0e901db78
pdf-font-stream PDF embedded font (sfnt) at offset 0x111C0 16392 bytes