Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d4412d78460479…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 10:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 088b6260db7504bd80575c21f17b19a0 SHA-1: b2d5bcd4096199b3a772696f5f8024fe4295ab61 SHA-256: f7d4412d78460479836ede026440594af3bf91edb11b2787f3e10e79adf2937b
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. It contains multiple links pointing to compromised WordPress uploads and other domains, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded URLs indicate a likely spearphishing attachment used to deliver a payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16139b6c879daf---jikukawupibukimewedigab.pdf In PDF document text
    • http://innotec-industrie.be/userfiles/file/34821595817.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/makugavidokavime.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/11318410057.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/65003323541.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210903_9AD70AE9CF8D8795.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/27125317801.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/18056900157.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/matupadinebelepib.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/nibadajojufa.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161399c3a59631---rutukewidapagijoperajom.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/16607746067.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/wobixo.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/rexofufige.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/jisuxelofito.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/85662316287.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/2926470004.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134c24818658---vusebabelixaxibam.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/52668120489.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/mososonodudewekawewonobo.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/nikal.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/54681622440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+studio+java+sdk+pathPDF 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_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 17492 bytes
SHA-256: 1e27c769766a918f8d2432f7d89a72aa627371bc551347fe20427991cea3b25b
font_02_sfnt_off00011ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 10680 bytes
SHA-256: 69243624ed432bd3cc44d3869874dff514ce4add3a45623ba36d2dc09172e6fa

Open this report in the interactive analyzer, or submit your own file for analysis.