Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f84da008024ffa…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 11:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3da60a0c4c1eb5632ddcdaa6ab5a5cc SHA-1: b2312e647b4a067a0e8f1f999e04c930298ac6b2 SHA-256: 83f84da008024ffaf3fb59b1a5257b2c3f5cdb374db0d143950d7026156b6464
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload storage locations and other disposable hosting sites. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://granitnet.hu/editor_up/18902988078.pdf
    • http://24horasnoar.com.br/ckfinder/userfiles/files/ropevujedefugupigonemiza.pdf
    • http://ayhancevik.com/images_upload/files/73867258690.pdf
    • http://ecohouse-lab.com/userfiles/file/89131828418.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b66b8605233---kimukawibodude.pdf
    • http://farmaciafasolis.eu/userfiles/files/rasapuzidemuwafat.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8f2a4d33dea385b24cbffb13975f0cca/desosejaf.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/jukosokim.pdf
    • http://itkaufmann.com/images/fckimages/file/75854215110.pdf
    • http://dmkaudit.sk/101/upload/file/41875340333.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/63935629530.pdf
    • http://bjallstar.com/upload/file/vazigavudife.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ovsehgau9bm2f9o1sdas7g40ce/tofukelamudifadurimeg.pdf
    • http://poltinik.ru/userfiles/file/81554739613.pdf
    • http://aaaexpressheating.com/userfiles/file/81181854328.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/qj9d7drbp8r20qc498of19po2c/81950107316.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/e60250bf371554dae56957d9340162fe/14493468737.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d38d09233.pdf
    • https://fallsplat.se/bildbank/file/4998532367.pdf
    • http://co-wemart.com/careeruserfiles/file/gafoxekigufikuferitagutow.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089084580ef4---87755867414.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/cqcsd4fuq2gebgss3go9ee4cip/nifiv.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084082c063c8---84271471708.pdf
    • https://digireg.cn/upload/lofur.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=two+fate+lines+palmistry
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f74b.bin
09b4a29770fef81de2d9c845d75e84cc7b55aca85397ac0d4e35c737567a6f1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 17684 bytes
font_01_sfnt_off00012483.bin
0868e7549eba5e207aada70750511b1a6375bc8a57d29740fd1158bd17adf901
pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 10680 bytes
font_02_sfnt_off00013d10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D10 16792 bytes