Malicious PDF — malware analysis report

Static analysis result for SHA-256 6683407c0e4953aa…

MALICIOUS

PDF

90.0 KB Created: 2021-08-01 19:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c0b02ed56c3760d1ed7a0944b7fdd39d SHA-1: 96411404de28c1dca4793d5436bb59642fa70701 SHA-256: 6683407c0e4953aa70a3fb94dccd32342d361ca39f2ca156e9d2c4a33c281efc
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document's structure and embedded URLs indicate an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/tprfegbtt00lk862g3nmql7obo/4177390974.pdf In PDF document text
    • https://fwullong.com/upfiles/editor/files/42769770841.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a93018084---tonirobesu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/dd4f0b0864c8d8fe706713cba2c7426f/56641542735.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ac53a62389cf02d0c5de06b0194ae275/sogokafapinorasibedufe.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/19mnvie7mu5qn7a31ctjrft501/kowibenagarosap.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/2218387086.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/9958769109.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/78743552121.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/ad3c086d87184cadb080c6935ad64b9d/wefotakivalifi.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/daseridena.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2b8e694470f1a78cda417ef779e5df72/22996241929.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d42f7a6c292---tumitivajum.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/227274536abe8c466401ad2d055c86f7/xaguzopozimavo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/db68f1df475285776c2a75cc0e892948/wesatutegosijizezi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e8b7c1a38---dufimaneboteginagonovif.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/71460eeae401d56c1303d664c72ac8a2/pikuzobijof.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/17947600967.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608786fe8774a---92139904762.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/nuvokinasilelorozatekosuw.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/02f95ca4c5b2a0c26c3d1dd1dbc91f67/50110246446.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0b233751---16347325594.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/zudedemarigepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=top+10+best+offline+battle+royale+gamesPDF 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_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F74 17728 bytes
SHA-256: 5f591a71dee7f017750350489dceb4838c75c2baf6a3be3b7abbd689c6722501
font_02_sfnt_off00013dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCB 11092 bytes
SHA-256: da9976df3828c6dd68bca22bbd711de11ce1cadebdc2454f4b52a2af16c9b9fc

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