Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d1233f45adb7ef…

MALICIOUS

PDF

95.2 KB Created: 2021-07-14 03:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5cc901d1625e38e52bc3af69a2b64ac SHA-1: d121795268e95ab8037cccab5978b28a4d69dd0d SHA-256: 40d1233f45adb7ef008bd35d7a4ad1be81d61935ff64d38a50a4a018e1704acf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The PDF structure and embedded links suggest an attempt to lure users into clicking through to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/87228976d1b83f5d26bab10ab1f06f0d/fonobezogomopitajedego.pdf In PDF document text
    • http://ac-kenigsberg.ru/files/file/dimak.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/ronozisujijopegi.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/dfac19e9a7cde5cf8351d720001ddd57/mutuxibajipisixefugadabi.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/wujatodojapeji.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/19227515778.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/cefdf6448fb8c1691065e28da57d87be/moxepofajikelara.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/dufimot.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/d5a694538a9e47bcc4cfd7a154880299/5088345631.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/33368447051.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/71pheun7nf1j1o5rd98i6msgv1/98712827859.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609be0767a022---91262342516.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c47ad9015b9---42327847186.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/8914813700.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/widisilure.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f3ibcbn5jfmmkm06qlrvgn0cl1/puvizejokotulanu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ivtgf1f42kequamkrmt1ln03c6/10571508534.pdfIn PDF document text
    • http://bptramptour.pl/files/file/36842901578.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6c98e75a7---riwiguxenuva.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/dupovategur.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/47422112791.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/73897543759.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/nijilonudirifopu.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0980554abb---nuzusazukowudij.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e6341f324fe---sazamenidujenamagowe.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210620111530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=adc+air+forcePDF 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_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBE 17292 bytes
SHA-256: 11c52a734050556f0eafd8ee0b682e51d2d131624a17847cdf4e271951586d14
font_02_sfnt_off0001594c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1594C 10032 bytes
SHA-256: cf58abf7fa8cb73d5efbd12fd0bb305211bc89f34f80ef5c5649171cbedef3b1

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