Malicious PDF — malware analysis report

Static analysis result for SHA-256 f206795397013b94…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 16:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ae4db4691b4d6abab54d471531ebb79e SHA-1: 6467de3f0bd88f3d71a441dc512acbea8ba26db1 SHA-256: f206795397013b94d05dfb1b287f2dbea462a9b913318cca4f92fe1a81c46396
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, employing an image-only interface to conceal clickable links. The embedded JavaScript and numerous external URIs, including those hosted on compromised CMS uploads and disposable domains, strongly suggest an attempt to redirect users to malicious content. The ML classifier and ClamAV detection further corroborate its malicious nature, likely serving as a downloader or credential harvesting tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=can+u+do+a+3+way+facetime PDF link annotation
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/96741608093.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141736d01e66---93983119666.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/kovamadufibedu.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/4832347988.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/36408733218.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/joxojajusonupamiwofegufu.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/mezimoni.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/zolopokafarufakerifa.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/toxikujaku.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/51127327235.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/bobarop.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/varinavugobevoxujo.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210924021144.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/namomenab.pdfIn PDF document text
    • https://medtek.vn/storage/file/27971801308.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/nowigebamopetuwarega.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/7320813262.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/72589915558.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614025406443e---33595826816.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415504403d0---66830791425.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/44867517003.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/sitosalegibo.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/44315512581.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/19874269617.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/50435381711.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_off0000b299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB299 10824 bytes
SHA-256: 5dc0ef81e681c4f447c99dc36abee16e670400e40ecce72223d3049d3cf19f1f
font_01_sfnt_off0000cbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB6 13696 bytes
SHA-256: a3046d17c1d6b365699ceac2951455769384af3d4c89b2688a0965cf60c0d319
font_02_sfnt_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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