Malicious PDF — malware analysis report

Static analysis result for SHA-256 b853d627f6a6b887…

MALICIOUS

PDF

75.8 KB Created: 2021-09-07 05:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1cd747eb1471c0c41c4daa9e352769ba SHA-1: 2e941411efd2b03bdee701f2a86843b2f44d9f86 SHA-256: b853d627f6a6b887e4a0f9f3dda2dbaf6855253951d95bb1f180d766f8ba5dfd
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 ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution vector. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to malicious content, leveraging techniques such as spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://dobre-akce.cz/media/files/file/26462140543.pdf In PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/39263660510.pdfIn PDF document text
    • http://honghuibio.com/d/files/6663307074.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210804073836-82359195025.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/73765194869.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4cb5d6cdca8626d30aedc8a88a178221/xoveba.pdfIn PDF document text
    • http://gojjang.com/uploads/files/7662001884.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/kazunijesadabimakip.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/mnholdrbijs5m057j03gp2gh0u/duxupanavaxujovo.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/rosawejijutusefa.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e22fe51ed7c4cf67610a279ab37a0fef/nofizeko.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a7fd695c7---vamozataxamiposunalabetej.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/t4jj6kds96vc047vk59tqemmh5/severenivefogojad.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/zipusolavefaxi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0d6e4de1a---67127665141.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/b4b44696c24cc4568cb8551fc07f9968/kexikadulijufikuwalid.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/sekejojubagufapeponuvawu.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c8cc9d9b---merukov.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/zegitapazedaxigo.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/61060062691.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/pibalaneragivubikajep.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/85661757435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pdf+to+ms+word+convert+online+freePDF 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_off0000c52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 10628 bytes
SHA-256: 9226ea7216746005ed67ebaae091f04a1c95dfaed2a97daf0e73a275ae4dbaf3
font_02_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 17160 bytes
SHA-256: ea0b24b580c291b012c6bc745b54eb04d12399e137ccbfa6acfc086ef817001e

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