Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d31deefb186c201…

MALICIOUS

PDF

86.1 KB Created: 2021-09-10 15:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4530133e80c0abdc85ad4e820c4a932a SHA-1: 687642b7448848e72a2a26a6d5f23fa31caddc34 SHA-256: 6d31deefb186c2014deb05535b9a9245f8ff306c26a13abfb6ecddb0c98f2eba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a second-stage payload. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://lycee-elm.info/userfiles/file/21037440113.pdf In PDF document text
    • http://newgrids.com/userfiles/file/lelolojisolaxu.pdfIn PDF document text
    • https://deepex.hu/hirek/files/84653045426.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210904123253.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/givoridusirokezuga.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/wujoxejoperabobu.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210908_EFE92BECB24E83B2.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/fofopan.pdfIn PDF document text
    • http://cloverdiamond.com/file/tifokunekawezuloxu.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/62ftch52s54svct5qlsfel84jg/76467182748.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/gigoxodomagobi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d228b499c---momuwuzarukovimu.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/42832234301.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210904010329.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/wodezulenutibabuwili.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/xozituxobokopigidita.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/tajedasusugekudenonolapit.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/21391450941.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/cf9839dc6509ef831ed67ae0decb7fc6/34232330555.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/kapumiwamaze.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ad3cc869---livujadugodezarawatevud.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/86884001738.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/91301935335.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/37046716825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cinderella+man+online+freePDF 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_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 18836 bytes
SHA-256: 0a5c14a7976ac65c1516418e8dc505a6fc5bca6d7a7aececed8f91c8e463a309
font_01_sfnt_off00011bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CD 10280 bytes
SHA-256: b1c44cc9360cda33ac9d15f8d3284032c0e90ebe853631ab4a4c312c731f11e5

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