Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5fb7246f55ae41…

MALICIOUS

PDF

116.2 KB Created: 2021-09-17 03:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98f085c8cedc0c2205761e61f1343a4a SHA-1: fa5aaef2104271fad0246d9907bb0995d80cbf5a SHA-256: af5fb7246f55ae4121d314cfc078d1153dcc2fca3ac3f0512dd3917b44facea6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely intended to distribute further malware or phish for credentials. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=mulan+free+online+1998 PDF link annotation
    • https://tahitotfalu.hu/ckfinder/userfiles/files/mopewufodid.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7cf6f9b1b86b9d324915bf814e369d6c/47630253369.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161426c41eb179---pabovanulolizudifamaz.pdfIn PDF document text
    • http://4yoga.by/pics/files/58969410107.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/reteveso.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/jiwelakaxexelawafe.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3eceb0dfe---79887212960.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5671cb3e368c420557d460ea69642024/rasimotejuw.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/mojogo.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/44373639829.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/38140397380.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/dijufonepuxuzumunu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418eb36b670---vebawokofumuz.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161438f248b21f---14956966899.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/82489320155.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/subuvuwanusegifaxoze.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/29862765257.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/gobomix.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/47053748318.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/13943794593.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/gemox.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ebd953d16fd1d46ba09aefbe83569b51/lasizugumajupofesuz.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/67917604132.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_off00016084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16084 19416 bytes
SHA-256: 596b0f5858f00753046f3f57284baa7da0970f3ba1366f1ec025e9d00b6890d4
font_01_sfnt_off000193a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193A1 10460 bytes
SHA-256: 7f2af16380abf2cdc7d2416e4d6c11ba89637dac4708b6d294e738eff904efa3
font_02_sfnt_off0001ab82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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