Malicious PDF — malware analysis report

Static analysis result for SHA-256 f319c673ec9f5025…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 09:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: afdcfc83086d27c8e4f28cf239af344e SHA-1: fe47ae475f0084a1a84cda7a7838255ed7da181f SHA-256: f319c673ec9f5025e300c5c904bf772571fe8b83ab280439ec452d70d69849d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fde911f3a---torepuvegamukebutox.pdf In PDF document text
    • https://people11people.gr/uploads/File/83765822206.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/surobeja.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/29073896394.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/zatolamidegawumi.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/zufurepavejobabazimewi.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/siweluxobesof.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/rewejidetisapo.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210902_42733D6F0BCC1C48.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6b8453c23edd6dfd7680737a5e43cfab/jubisorudexaxiwutowur.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/gebunoxu.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/makotuwarapesubi.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/wowatodavosan.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ad5b30ec2b1d947b94cccaad0c22976d/92902393158.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/tazusotalosutokilij.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/lodorozuvaponesupu.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/3309149914.pdfIn PDF document text
    • https://slotpt2.com/contents/files/jejijenaxolovoturuje.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/japujisajas.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/44728957035.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/fabaraw.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/18543450647.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/xebeperediwusawusivej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cara+membersihkan+file+sampah+di+memori+internal+androidPDF 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_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 11024 bytes
SHA-256: cb91de967bcb9f4dc66d8dfc3ec385b7f9540fb936c2d0338a606e595257cb5e
font_01_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 16492 bytes
SHA-256: 9787f754b25e3709ef96830b57ac4915ee0c3d51f07a30c8d78307096c0e41d9
font_02_sfnt_off0001202c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1