Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b081cf283465d16…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 20:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cecba781b31c82d1b7d51779ff0d63d0 SHA-1: f360ab22988c84a86b80c20d435b769132e81f26 SHA-256: 3b081cf283465d16cade90abfd0d546603ba3adc9edca8eb864604ecf898f5d0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links to external websites, several of which are hosted on compromised CMS platforms or appear to be part of a link farm. The primary function appears to be directing users to potentially malicious content hosted on these sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/25774139848.pdf In PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/36818344377.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f575a97fe5c8bb1cdf5bd08e543791b8/povulon.pdfIn PDF document text
    • http://sung1.com/upload/files/vapewitinipatugobuzi.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/tuwob.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/55932060765.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f256555b6c2---texufujemivinexurox.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/7f8579710b1e7a5d559f6a9351524a4b/voxegoke.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/8768668233.pdfIn PDF document text
    • https://isleo.com/i_photos/file/meweduxelifol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35f847599f---97540912004.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12db5cb444---vofevekaxaxedategarowu.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5f341357ca349506fe034f5902d3acb1/ledisifupelamor.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/mawabujasesolerikameni.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e1c569c5b---14223941181.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/b5195b1b17768f3bbef3fefbd533a429/kobuxoxiju.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b853c42645d---zasiginarag.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/fuxoxiwizugezafikofame.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/d06vs2dkblva7qnh2lqegr18hf/40966096879.pdfIn PDF document text
    • http://kasargod.net/uploads/file/tikusotitedejeme.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/fajemupesopalemelur.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f2b0827659946d7961ead57b571c1525/nafiwofipotavanak.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/geluvawokinuniwixoseg.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609445580e9c0---71076452854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=effects+of+population+growthPDF 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_off0000e186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 17568 bytes
SHA-256: 3e120689d8e8b6cbaa66e781521707709169b021b6fdd03f1c19ffc76b01a4a9
font_01_sfnt_off00010ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B8 10928 bytes
SHA-256: 70c3c47ecd79ce80a31ff4c957813c9cc383bbdf3461222898ab6f1e8760c59b

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