Malicious PDF — malware analysis report

Static analysis result for SHA-256 238412f064072766…

MALICIOUS

PDF

75.6 KB Created: 2021-08-19 01:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6b097016743a0ee66af1a53a1d4bb2e SHA-1: 423deb364ad409e87e6f6de663ecfa9f6133de9b SHA-256: 238412f064072766d2a3fc1c6da4ee5b947481685041da10ec4eea6fb048eb4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=find+my+phone+for+free+online PDF link annotation
    • https://sokolzgierz.pl/web/uploads/files/34735910549.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///zuguvelagozifagulo.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/34366493246.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/tosuverolujofexavefenaza.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859ef241476---xesuwipijatevikoza.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/g634okvoqu6vakr3dlj5uefthu/wowebojefijasitupapud.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb2e792a0a---83879316367.pdfIn PDF document text
    • http://meskerjager.nl/media/files/jorulelifadasegafaxipug.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/rarowusigewewupolunodaki.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/jidox.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/7276258635.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/87823613814.pdfIn PDF document text
    • http://ezibra.pl/upload//file/57911778781.pdfIn PDF document text
    • http://yilip.net/userData/board/file/bajilolutodibukari.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/kagod.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db361497e7---40949054938.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755a444b3fc---pabikeposulazetimedida.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/tegatubironu.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/fonokedewofofene.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/46084197510.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_off0000c682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC682 10424 bytes
SHA-256: d5fc7fbf489a1681290c2032fac6fe7ed16a239a425c89933514a991d8c9d753
font_01_sfnt_off0000ddca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCA 16580 bytes
SHA-256: 69dd5f970775ee1831eb2a4771258386e16cc593cdb2ac07eb011ef045efd943
font_02_sfnt_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1