Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5df639ffcf80dd6…

MALICIOUS

PDF

126.9 KB Created: 2021-09-18 23:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 12451e50a42a8d462fee94b844219b50 SHA-1: fab541e9a7ab5f075c46b3ebfbbebc4648f09d69 SHA-256: a5df639ffcf80dd678aa4c5e0d83d4d1933324210665b75fb258168125efe64b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://urdu-hadith.com/survey/userfiles/files/53455031452.pdf In PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/badudesa.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/17320323377.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202197205022268.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/guguvujigelewokata.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/jegavomazevawin.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/97747843192.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/85134622836.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2bf3d1a41---komepalaw.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/mn21ue3hq93h0pf3eb5afe94hp/48614876009.pdfIn PDF document text
    • https://eventaipei.com/upload/files/85279157951.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/xinojezakobosuv.pdfIn PDF document text
    • https://artbynela.com/uploads/file/61939580706.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/24403107703.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/3158508812.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/kazajofewobixexibazida.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/nidojuneritebifugurok.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/vokukifufu.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b7af8c1f78b1a609279586817e7a1b46/75595462044.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/vopamibakedijajazen.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/luzizovanova.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/28565790710.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/10189918979.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/dg7uniibal5tel5q9vs4dv5p90/kifoxuzabukomotapitame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=is+the+pump+shotgun+in+fortnitePDF 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_off0001882d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1882D 10648 bytes
SHA-256: 3b5dd0bdcce965675cd75a49e80b37090208a1dc10d79b57819b1d6acb0361ec
font_01_sfnt_off0001a052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A052 20204 bytes
SHA-256: 7e433823823ee4692f66273aaef862b75f5376fd5e954f643692367b31b10ed9
font_02_sfnt_off0001d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1