Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2c1217923628b4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 03:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cb3436cf687a6f18ae22225e573bb093 SHA-1: 040d67543e8eddf4fe8a5cfb02f640885475b894 SHA-256: 6e2c1217923628b478a86c608ca78c54ec08a4a4606aa8940249f9b6551dcafd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites, often as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=musik+kaufen+mit+android PDF link annotation
    • http://rigassprotes.lv/uploadz/file/75526692415.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/rapikexaligudapojaj.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/bataxazusinirefuku.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rukazetugir.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/venevefasivarovak.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b20e73ce7---xagajemabujewigevuged.pdfIn PDF document text
    • http://machin.kr/userData/board/file/42586654477.pdfIn PDF document text
    • http://k1a.ru/images/files/file/35952080721.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/funukaselulefutarimadadez.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/naxotumepodekaxaf.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/3405375078.pdfIn PDF document text
    • https://artenika.pl/fck/file/daxoxaboguzuk.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/zijidotobojudomotuk.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/48746138329.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbe7b4a88---mufeni.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/petajagumufegoridujalizis.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f6774853---64844842392.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/berurirudewi.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/birogivoxekijilofudi.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/53386349559.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/xebam.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aljq7qri4homcasrror7701lc7/sisowiw.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/xatugupejed.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/27750188532.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_off0000d431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD431 17968 bytes
SHA-256: 4fd59c1d35780b69a79a26479ed28563ae79d423c431abdd3196fe409379bc24
font_01_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 10656 bytes
SHA-256: a6bfef13399ea112cfe1a5347dec3e64110aa518da49d3ad1f0ae12af5626129

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