Malicious PDF — malware analysis report

Static analysis result for SHA-256 16661cac28841af8…

MALICIOUS

PDF

86.1 KB Created: 2021-08-25 18:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f64faa5fad9ea23ad3aed9b8d9c42a77 SHA-1: f3c4f164d5fb1233ca762e87ebe6193415a102e1 SHA-256: 16661cac28841af83269ac7f6fa6669337fe84e07a174ad13f06a9feddb63a80
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

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://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e57d0803afebe0991c59bcc594617c88/45866970263.pdf
    • http://ekotronic.eu/files/file/penulureluji.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa45a4b96---dexuzepapewavemiwax.pdf
    • http://progfin.pl/userfiles/file/vusoniregeto.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9a00a9648---29403860971.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16087a6a47f7e8---29372933789.pdf
    • http://icmasistemas.com/userfiles/files/42476673849.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/f2e917af4a1f6904225b1104899f661b/zajez.pdf
    • http://amandatravel.com/userfiles/file/67458799096.pdf
    • http://bolt.fo/public_html/userfiles/files/mirapaxivuj.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/4b0b26168b6f4fde7fcbc700c9fc3670/41019507225.pdf
    • http://domeinbeverdonk.be/assets/files/file/58494420777.pdf
    • https://annekienlen.fr/imagesfile/12484288975.pdf
    • http://climacom.eu/userfiles/files/57793343180.pdf
    • https://landbondcorten.com/attachment/file/aa092299a7896e9b90311c9fc369c0bb.pdf
    • http://emailreceptionist.net/userfiles/file/89384484754.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/urtt5d7i5ti0svgrpqihhbu6i5/79902191217.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b3bf1812eb338f8deda903398b05cb92/lubajusob.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/db3399db1b021103a4698d771a5b6a15/17544859644.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8866d7e90---84086846620.pdf
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/binep.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/dc6aea76b9653edd1fca2eabd6ce87f4/tujobodovejokulis.pdf
    • http://hoangnamjsc.com/upload/files/21720733139.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/b6e1f35654405c883b21bd900ce89dd0/53134984363.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=baby+pitbulls+with+blue+eyes
    • 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_off0000ed3f.bin
df428e73669f53d3e554db46eb0937d16ba6143cccab8f94fefc1604673d8d7c
pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 17360 bytes
font_01_sfnt_off00011a29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A29 16792 bytes
font_02_sfnt_off00013240.bin
66f49902d19b1041c0b39be48390207780f6c27c0fe0538042cea3fcf3d1d484
pdf-font-stream PDF embedded font (sfnt) at offset 0x13240 10516 bytes