Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a54feb7592d0a41…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 23:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 888a403d8ecc90233b8397b3c85c5d51 SHA-1: a9af068483786ba5840f70fddb4cf6af48816050 SHA-256: 4a54feb7592d0a413ea99c616dcaebcac6cf607959f96df59b064fe5206daf0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs, such as https://crewmak.ru/uplcv?utm_term=ben+10+protector+of+earth+ds+download, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=ben+10+protector+of+earth+ds+download PDF link annotation
    • https://beta.nhatthiengroup.com/files/uploaded/files/17199881596.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/nibuvesemulujuzekosulu.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/laxeve.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/lirugigi.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a22531548a76903ca552c06b922b75d9/pesopitujawa.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/karijatepopatoti.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/solajolanas.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/jutosixokumefej.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/11846714876.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/4d0fe9d90901e9403e77fe9db1d18197/11256001038.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aa70e78d1---nolebomupivilijuxibupig.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/suniditoku.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/98988761934.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/7200502251.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb93d5b39f---safobolalubezefi.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/majebi.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/pekozejejurosudok.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/rafuvibulisomajuvu.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134b10536e7b---10283502706.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/8257409703.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613737929df47---45786705295.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/jorupo.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/vugojibezawereg.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210902_E901559149D16950.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_off0000bc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 10936 bytes
SHA-256: 8ad442d348fcb6045f65dc61d12a1990bbe0f1ecc8c7f69889bbff13e48f2838
font_02_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 16660 bytes
SHA-256: dd28a5a0d6aeb0554d5b7b9e8f27f7ba228c7d6dc203c9a8960826a1849545e8

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