Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d470f855634cf02…

MALICIOUS

PDF

91.3 KB Created: 2021-07-14 08:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2258f9ec5d03c295bce22d7e1721c18f SHA-1: a4be38836c72382eabb6a3369ecc675bb9805a48 SHA-256: 4d470f855634cf026b6885ab05653d2de657e49f813750084a5d5ef9b5c61b7b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, suggesting it's designed to facilitate the download of a second-stage payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dubaimotorcycletours.com/uploaded_images/files/pifazatudekiturenokujifot.pdf In PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/surujijuxajisawamew.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/31537989320.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/56075724327.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cddfbbbdc8---66598275092.pdfIn PDF document text
    • http://technocom.pl/editor/file/vifupinufigifewapeno.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d825a0f1c5---27179099577.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160760153a8b43---48082674212.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/rixogebizemekosutenoz.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e836f6d7bce---99526821703.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a09ca55753f---48149519324.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94ad9f7cd---55780767350.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a1dc0ed67---dasowirizelerot.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/somukasijudafizap.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/76150013507.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094abf734af9---24490708317.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/3530c50eb2b09000be1025cfa47a45ae/41883740687.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/tufab.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a0f9bfadc---ziwezajazawowe.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/beb6045ddd30859db777e0f74f535312/saxadazezovafetij.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/zapizejonuduwi.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/72202956197675b3728c8597d01930a1/vuzakefewijilaj.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/91142991663.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/5pan0liio4usr59s3es65uotjo/xilujejejodejuwixilanitab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=r+software+linuxPDF 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_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 10540 bytes
SHA-256: b7a21dba7646e8573094d544177d262c05e28b3b17daff4b281dd10e239dc4d1
font_01_sfnt_off000118ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BF 17572 bytes
SHA-256: 523c8963054d5d8d462ded63e9d13c77b60073a41ae5d5b6c719ef128a95cac0