Malicious PDF — malware analysis report

Static analysis result for SHA-256 b398a3f01e398008…

MALICIOUS

PDF

84.0 KB Created: 2021-07-18 23:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c9d1884e24edabbbc9b47ddc3e7c384 SHA-1: 8759ec25d5ddbe320dee4ab37ec06bd8b2cf7944 SHA-256: b398a3f01e3980081da9fa85c0aee3c56453dbe99e2b41de62573bb7a35a60bb
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://aven.su/userfiles/file/temipasofurutatumoguto.pdf In PDF document text
    • https://soudurelauziere.com/upload/editor/file/91612857739.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210627_ED754D89C92A09B1.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/42526838842.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/8c2342b1ba5a77b20d086c63575193d2/82916798075.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/53089190949.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/vabejitomefofumasalem.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ad9devg24h0qqlns7d8jkv1qor/79124822018.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/tibanobotusuxejewes.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//31213330065.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/78981630367.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a485dae199---14410697416.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xelogid.pdfIn PDF document text
    • http://mousike.it/img_ins/files/vikevuwano.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160909a4995855---vemijazolaromevibulodax.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210610203605969107.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fa0f4101a---fewux.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccb6318a51---gonajotige.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/rukurasulipu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c2a6ef5a3---6827572668.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/7956063593.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/wotivopogujuzemuwejedi.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/tidalogegeximirufamufudu.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/899265e76e78633244a112ba364f517c/30758120037.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/rodawu.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/73068613662.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/jeditolatanuremugozuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+pronounce+directionPDF 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_off0000e2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 18340 bytes
SHA-256: 576d70bae7b329a92eb351ea13acda702b5d94de973da4ca7b6c9a10e9640511
font_01_sfnt_off00011326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11326 10308 bytes
SHA-256: d5e313c2fcb33760f3e79b1501f1a2058d4d11acc5e7d4742d593cf8deff6b30
font_02_sfnt_off00012a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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