Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a64e375ce92964b…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 05:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53b40a7fbecad8792bb879faac37ef16 SHA-1: 01dc7f6dc2b8805657ef37da53f2c75f62f73c3f SHA-256: 7a64e375ce92964b8f51a71a9d1d835e1c66ac292d852ad793688291f69e7f92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised CMS platforms. The embedded JavaScript likely facilitates the redirection or further malicious activity initiated by visiting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=android+switch+to+new+phone PDF link annotation
    • https://endobible.com/userfiles/file/kogeta.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091311574088.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/44052fef9299d4b579982e971194fc7b/sabawowifuveto.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16131a6468899b---28183619866.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/6132943944.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/14171811305.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/82020143292.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/86298135796.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/24543482788.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/19104490127.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84524565033.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/zonupafoberaxusi.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/93573851069.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139eab226103---zaxini.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137efba6e327---13363878928.pdfIn PDF document text
    • http://annabarons.lv/files/files/75329319444.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/jejurerugalezogi.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210908161107_mz25j6.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a0e97b3d79db8b7a0b8b869cd08a9199/gelolofekusosezex.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/4289080179.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/logiropa.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/rojemigonepezuwerega.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/54874905157.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/9012415391.pdfIn PDF document text
    • 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_off0000e6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 17656 bytes
SHA-256: f68e0662093b855a68a1fea108fe8c84c9b82db2e74f13125295c895b65d62b2
font_01_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 10468 bytes
SHA-256: 171c774f419596b004f37ee285fcd9288ba96ae27ee3e0c01a8f47e6f90a4e6b
font_02_sfnt_off00012cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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