Malicious PDF — malware analysis report

Static analysis result for SHA-256 90139d15cfc291ed…

MALICIOUS

PDF

70.5 KB Created: 2021-09-07 00:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12ee367196b4536b714ec3616db723f7 SHA-1: 4d66b130fbd4915cc854901c007792986230e118 SHA-256: 90139d15cfc291ed7eec4c9890620d5accd3a9d82f04e1356979f39fc16cd370
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm to distribute phishing content or malware. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to a pattern of redirecting users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=omnistep+550+manual PDF link annotation
    • http://solyaris.pro/admin/ckfinder/userfiles/files/lovuxetugipujigika.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/tolevimemopibok.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/pumovogofedapagapojuwal.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/napijomawagerekedinagaku.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/538ce5005c65f33649f61e3679be4e26/29996287263.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/53031972647.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/22156202618.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/kuninokokotopize.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c015d6d72e3e9b6d66f1737a1b3da89/67193759151.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/388eb32dcd5378bc290cd488dbf7c293/vapirumoledefu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16095416e5d69a---pumusux.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/l504djtjncr8mdhl9q1a8ifrbp/dutiva.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/61702447758.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/64981903057.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160836f41ca54e---nofefe.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16098308327edd---18368207434.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33569884515.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/rikovulimimizewu.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/21258137414.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/9t9ct09hiqum1gnl3uff5vtsv3/78770892371.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/81911781112.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///49120295991.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_off0000afda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDA 10572 bytes
SHA-256: 8957ed615c90dfd3e69be7b5a6e7f83b69fa88c2c8af3e2a28cf5d90af956dac
font_01_sfnt_off0000c7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FF 17808 bytes
SHA-256: e648a3446e5647fe3e75e0e27e1cf93ad2172c7c6dcad61e6568b698ccb5a714
font_02_sfnt_off0000f4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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