Malicious PDF — malware analysis report

Static analysis result for SHA-256 004344e50ab71d17…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 16:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 274b7b7c818c6a84e83e68eca24a5849 SHA-1: 2bb1be17a7ae25a39f84bc50ef7bb1e62497ebb8 SHA-256: 004344e50ab71d170315dca3e2ce173afec70013d584cd006ae7f9dcbddd422e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS upload storage. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huanghecables.com/d/files/28209649989.pdf In PDF document text
    • http://33podarka.ru/pictures/files/60502615282.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f4cca5f1---18759279506.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082777556dd7---xagoxinosew.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/vamewevejobobuzulimire.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/6936655933.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076ecc584e24---82470743235.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/divutekavagazogerino.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/jisenumuw.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/78502828408.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c07735eeaf---7526063024.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/papasoxivibix.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/90658556137.pdfIn PDF document text
    • https://computerzone.pk/file/mozudixiratojukaburat.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/dakamijunalak.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609410f80721b---zujobekaxoruvowaxozuk.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8pi3roftscb226lplaj3453p57/77155384722.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/6snh7jlbkgma4h8pusptbsp9bq/nozep.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/c5kthsigdt6t18id8krcjejfb7/navitejesufumusisobumi.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/92916097125.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/16481457974.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/92981966965.pdfIn PDF document text
    • http://championsview.net/userimages/84623883299.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/61724011410.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/91956572342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pancasila+sebagai+falsafah+pdfPDF 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_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 10724 bytes
SHA-256: b84a0c3b05ec68a026c26c7a3539ca42206692804c866e64eeb37d788ed3a188
font_01_sfnt_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 17248 bytes
SHA-256: e75d8c431bf902033a668eb9f924c241d04ee7460ccb56c2b390af31f2355917
font_02_sfnt_off00011f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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