Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40c5dbb00ddbe39…

MALICIOUS

PDF

91.9 KB Created: 2021-09-02 10:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c7d006326a9d14fb7e06f567731b17c SHA-1: f9637d724bf8ba213c82823fe64e09376d57f0c0 SHA-256: b40c5dbb00ddbe395738e8576775cb2795e39e08c968d5aebd8f7cf7a4e780c2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware-hosting sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://krisoc.ru/uplcv?utm_term=computer+select+all+key PDF link annotation
    • http://kleinschaden.expert/userfiles/file/bezipapupofotetakixora.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/d8c8bfa03f96879838b8d3e8875b783d/50804717947.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/32086718267.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/82645283104.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/3ac620f80371fedacd2080766cdbc59f/lukejuxibabofaderejipolu.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202108260046297970.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/fokozejuwurinopoziruj.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/19805779055.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/85d9e5e1746a761514c0b328b2fc4d90/20951335326.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/01afc951b175a873c3a7c636a3ccf723/13151717422.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/98365675291.pdfIn PDF document text
    • http://web68s.com/upload/files/56135987934.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/wuwatomimezeje.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/jumuxofokon.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/sogumuwatemi.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9a488569be5217300b1df92edc57466b/79936579948.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/34866992211.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/tuvijifotogobesa.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/83648974594.pdfIn PDF document text
    • https://mvservice.it/file/dabaru.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/5d2c31d4b8987c3fd4616bcffc0c30f3/14017515321.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6e3b111d3edf550d2e57a746ee635b0f/keralasori.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b0f9d30e8---mekilasosowixas.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/69186297546.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082eb9c0133d---87822010521.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/pupepofebolideg.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_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF8 10676 bytes
SHA-256: fda21365a0a4495aef7cea441c555c22dfc1f61405da7542c71a37fd0b88535e
font_02_sfnt_off0001349b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349B 17688 bytes
SHA-256: 2802cc0a91317edcef4ada8af01289df1ff7bc7b03586333a93f86611b7834b2

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