Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc39443b38edbfae…

MALICIOUS

PDF

86.1 KB Created: 2021-09-14 07:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 80d452047b7143544288ed1152cf671f SHA-1: 891c7f5ca402465e73b59232d76d56f56b02addb SHA-256: dc39443b38edbfaef7daaab38d78afc84d54274cabc2f01f3e33abcaf087b8c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URI heuristics and link farm indicators points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=truck+simulator+usa+hack+apk+2019 PDF link annotation
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ad72fe95809f5c9fa547607e062cf17a/suzewibonudiru.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131839c2df26---17485088650.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/bimalalerarogutureter.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/29023755313.pdfIn PDF document text
    • http://glttek.com/userfiles/file/repabesukisi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f09b893588---xilab.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/46654340546.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/bikamujatazadosek.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/92366229172.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131033db9ec5---jenesijaz.pdfIn PDF document text
    • https://insp.biz/img/file/toramam.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/kolajelox.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613de4cb67bd4---rakogopolujuzelob.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fa2e9c4a18ecdcd0d4363813b904cc91/nupebixifo.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5d8c4ecf40c9401e47c795c4c684cf08/kuxejusafofoferolazafuja.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/43751693188.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/18766495061.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/jikopevexuvisaj.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/sapebo.pdfIn PDF document text
    • http://julianina.dk/upload/file/redozemenojajegunogagusov.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/jixizafidulumaxugoganexap.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/tazodukigibamirexal.pdfIn PDF document text
    • https://yasacompany.com/upload/files/bariwimopibegiboka.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/iu2m1h7hjmmmc6bdvh45nk1m14/30842399874.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_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 18664 bytes
SHA-256: 4981b2c1a2598edd238998bad2f622fadb18a76a38dd03ef03732faa031a08be
font_01_sfnt_off0001171a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F31 11020 bytes
SHA-256: 65d3f83e5c3e46a9855075bdb6d6fe9b5fbc5358148dd3a1bdba841a1de0e0c1

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