Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5a075a727872b6…

MALICIOUS

PDF

76.3 KB Created: 2021-09-09 22:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 259ff00759e4531e5ae4ea296949184c SHA-1: b6bcdbd780ac0682ac5a30779f7a73a0dd9fd467 SHA-256: 5d5a075a727872b61c2128c7d39291920b3afb25dc7b930e826350a0812d450c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains or compromised CMS uploads. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=example+of+general+objectives+in+lesson+plan PDF link annotation
    • http://autosoftware.company/autoresponders_images/files/perabevokagozoxuzobezub.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/82790449127.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613034007b9d7---mododebibabegezazeteb.pdfIn PDF document text
    • http://dominant.name/userfiles/file/dowijufexefijuzixo.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/64901778529.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210908_0E8E1CBB6156968C.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/mudogobuvojexos.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/kinapovimojipagigen.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/74357854615.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/fubajeba.pdfIn PDF document text
    • https://kvzriu.org/images/file/14936742188.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/24839347930.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/gumiguru.pdfIn PDF document text
    • http://rayer.cn/d/files/nabomapelumarawodu.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/65029673169.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/goriwabazak.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/rabopegodonowaveligi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tfaihb1hsrr062fgtd2m7r82a7/pimemabemi.pdfIn PDF document text
    • https://uangraja.com/contents/files/78925758065.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1f712a1cd---bijigemajekodaxoxigukazu.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///motinetovobixe.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/fizivubefagilubara.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/35770189985.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/vakemevezozogev.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_off0000c7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 11244 bytes
SHA-256: 2228ae63d47505c56116b866a7570b21e0063b0165662579ddb7186aee5bf076
font_02_sfnt_off0000fa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 15996 bytes
SHA-256: 6a7e0087589d90898cfb5d0fb2ce16282bf52e2017dd9bb9abc12456cf0cebe4

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