Malicious PDF — malware analysis report

Static analysis result for SHA-256 a916068ebbaae22e…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 06:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70f11173e46106efd944c988bc9c06e1 SHA-1: 090aa3bcce042ada0674b2867c4c9d8f793bdb21 SHA-256: a916068ebbaae22ec105d9c48436db33b75aca34e5900ac9ec458218aa68b2dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple suspicious URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=download+timestamp+camera PDF link annotation
    • http://aorganboys.handyfriendship.com/upload/files/neganafat.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140339fb94f3---gagifona.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/51bdb02aba85f2a32252c61f9316332e/gilalexovadas.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/27273398297.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/11164563605.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/69726873065.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/rofataxotimapiwojaz.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/73787983802.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/67454244378.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/37144795233.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/luvewubug.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9411f2c3---8530131316.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/78932700258.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161492ed6c40ba---zojozefe.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/88080593600.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/gizivemetetozuvekex.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613965a834721---64315051859.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/80234446626.pdfIn PDF document text
    • http://mirgalosh.moscowfashion.net/content/xuploadimages/file/21224978682.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/bimezudor.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/jaxufir.pdfIn PDF document text
    • http://feg.vn/uploads/files/lofivijitod.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/siber.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_off0000af02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC714 16476 bytes
SHA-256: 4d71fda0f2d8ba176181b81602577cb644910db0731003f73e1b2c652cd9c55c
font_02_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 10760 bytes
SHA-256: 6ea506fb9a93a1a52b9ab6ad9aa357e20eaeda8c16133785327d15ae0fb355a3