Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0e3749a6f8bee6…

MALICIOUS

PDF

79.9 KB Created: 2021-09-14 21:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31c6ffb00ce461785201cafdcfdcda69 SHA-1: 973d117b157825d2508e700d08f554590f448a56 SHA-256: ab0e3749a6f8bee62e9021709003ab3ab995530882e24d4d5971f05648ddb688
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, with no readable content to indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=change+keyboard+to+qwerty+android PDF link annotation
    • https://anpheatingandac.com/nbloom/fckuploads/file/woderafekobixusokopapewo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/52b3542782ea3272a88ae872763add6c/gopifulubajibetuxuzut.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/vefazizikawogajomij.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/napuxemozulikogirala.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e580215e5a6fcd73bc0b2c1cdc507f16/89060874911.pdfIn PDF document text
    • https://afayl.com/userfiles/file/20822671140.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210906_CACC4FE37551EC83.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/fivelamajugirivokowanati.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/labakiruzinijezubitif.pdfIn PDF document text
    • http://www.agot.pl/upload/file/tenifuwog.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/18898733790.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/mukosowomiziguma.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/jirowodebolurexun.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/kafuzufunifa.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409071de9f2---33691848802.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/50366633504.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/wazotopujidojuzumunupe.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/38237183381.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/aa2040943cfc8f04b06dea7e619992ce/16565130754.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/65361650083.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/netizarobugifu.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/23627049171.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/83508102332.pdfIn PDF document text
    • http://sial.pl/galeria/file/50600529381.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_off0000d487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD487 17200 bytes
SHA-256: a46a8e7f84662289f89f98992ceb4bbfae7766d59723e26c692b21f9a5f02fe4
font_01_sfnt_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11920 10924 bytes
SHA-256: 32990e50ecf295c89efd98541194f076246ff868d7d381f6e56869dfceb5ca3e

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