Malicious PDF — malware analysis report

Static analysis result for SHA-256 f084fd9282f3d504…

MALICIOUS

PDF

87.1 KB Created: 2021-09-07 23:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 594573bdf5acfc72916c02878e70046e SHA-1: dca722ee26e637f4f71222596860c7150531b0cb SHA-256: f084fd9282f3d50457365b96e4c2bf852913eaf8d8b8ed961a966feab6f798f3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The presence of multiple external URI references indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://jfac.kr/ckfinder/userfiles/files/43730894304.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f4e5a8aac---67015732950.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a806b7b146c---23746924292.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c593c67139dc6b14c58017220aef17e7/33378617354.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/rulebabipubokanujiri.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8d3dcc4e4---xarubidugelesefejotinubus.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/zuxamib.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f8b3a8e1077f45dea0d9b5afbb6cb62e/widugesujedusipunele.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/qdgpac8d0vvks28qvbcmolpen2/24141090150.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608611a9ea304---32895660820.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/51ecebb2e4b12e22729fb9c64b9eab7d/906717164.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/rozexetinife.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/10e0um26h118c8o4rtkmaung79/lirobodamenelevo.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/a4a1a3af9599032cd205c774f0b11dd1/tomuvupojozun.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/labajodipawaj.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/99d0dd52250ed51665cd58e55d024abd/gakexofaxetaka.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ffe9c1k16ftign24fku61o7nvg/ranemodafavogug.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/logefenirekoborux.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/femisebonadawupabefofaba.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8db4a7f77880c3556586829ad1b61e96/wekefofiniwuvi.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/e2d1ubncpun7bh400f4j9pqa26/19997349569.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/pisodix.pdfIn PDF document text
    • https://moolans.com/uploads/files/tufofujezodowukuzo.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/43451028081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=grados+brix+de+la+naranja+pdfPDF 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_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 10804 bytes
SHA-256: 8c5f42880ad9a06db601efb8d64cdfc6502ecbeb67f445a29e1dbc7689b48eea
font_02_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 20176 bytes
SHA-256: b8c354fccb94cb59675dd70237112fbb14db4b9c7b7eb58795b2d8b9a73c45b2

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