Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1d2614632b6e95…

MALICIOUS

PDF

90.0 KB Created: 2021-06-29 07:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: be81b537b7d8a0abcf5d8961f222a6fa SHA-1: f1e1282235f777088b3220a5937464fb77a12fd0 SHA-256: ff1d2614632b6e95eadd94edfb4f658ed419705da59aeae231979644ae75824d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the numerous external URIs and link farm heuristics supporting a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=early+termination+of+tenancy+agreement+by+tenant PDF link annotation
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/cdd7ee396d39abc49bef277bbd192ab8/sifizezefagelus.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c56e655de---lofakixojikoni.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/r915ihn4gjg1r1ogecl1ctscgk/faxulazotex.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/sugurukulerutakib.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/86217851984.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/eba636501e39b8d6de498f46c51fda34/besujapepojo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090993d5d655---notosofezevusifetuvif.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/77592463985.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/sizuboxavowebajij.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/576fadc9800c4b5d2daea47fede14888/80264929507.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/6c1bb8b2eff93eb18f22d909ba0f6a1b/vegeritizagaweb.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18d34ba0b8---25182383939.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/dawisodilapuxisutiweno.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/19d20d03ec4cd13defb6832f31e2d7b8/92267768526.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ea82b757ff78280ebd76c7f3684f092e/kozuwokesaxajakopalago.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/24949657859.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/mkgprrdvjrs1utcgkldld9hoo9/tenud.pdfIn PDF document text
    • http://fittbikese.hu/files/file/2425397871.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/29ab789959c28f16854e8165c45ad5e9/35456949876.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/aedff72237f11f1943612f3856b56b18/fidug.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/lobimuruti.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a923b97179b---fedekemejusaloragu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3f0cee01d---12203796433.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/odirorf5alhmc3il5uiikkh9ss/82433097485.pdfIn PDF document text
    • 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_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 10748 bytes
SHA-256: 9fd280a20829971b4865c2d1869258e63b24d841fcd67cb379d35c5f6c559a94
font_01_sfnt_off00011323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11323 17396 bytes
SHA-256: c9bc94220f9bd3decc50a490a3df18761f1491f9ca3aadad5c1afa609a5ff225
font_02_sfnt_off000140d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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