Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b569d2217073f3f…

MALICIOUS

PDF

87.5 KB Created: 2021-09-05 23:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b7084531d40acf8f7dc507eb2799f30b SHA-1: 99f9d50c131eadaf8f458da7d56827bb512b5d96 SHA-256: 4b569d2217073f3fb709b05c8f78545e271b081ab350c0a19b25bc81a49c82c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/305134473cdfd1deb13409ec8b8754cd/gusaroposizixol.pdf In PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/47886456205.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bf9ef2c31---ziwafosemunojidaman.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b78140cb7aea176317e46201eb4b3671/79605056509.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210902174929.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5912f43926---74180946532.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/23059090329.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d46f31aea0---nutuwuralituxulepez.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/6940f748d20b82ff7ab10f7127160e96/sinozogo.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ff9117353---39290223938.pdfIn PDF document text
    • https://ksuskalology.com/images/file/82586600482.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9144c0773d---3347419124.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/65837450425.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/ribevopuxen.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/6006398881.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/66435529529.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/18448287607.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/38960802296.pdfIn PDF document text
    • https://guijek.com/userfiles/file/26090207835.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ac3df31079ad22c28a1d07e50f3dff01/lidupadexapexaridoto.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/turufotupobetewajijop.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160807e5a68b7b---xiwiwuzosa.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/89424507333.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210522162168353513.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/5e4618ed2a597ecf019c13d09e5fd6ee/61517656819.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/36397343625.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/46435631497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=molecular+models+lab+worksheet+answersPDF 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_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 18692 bytes
SHA-256: 6db2b500b3e74ea68805a812be3eab7e587b8e6c3b860c8b75982dc6b2cd3b04
font_01_sfnt_off00011c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8C 10952 bytes
SHA-256: 87c69e11ec5b23c47acf4fa99089088fd807d20d7d1642a58f427a047f37721e
font_02_sfnt_off000135e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1