Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cf345efbb48f0d…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 03:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93243feeddf6f1f2d5d09b631b1868db SHA-1: 94a1cc408924afd2c11b2dfc6c52bbf3125d7c51 SHA-256: 66cf345efbb48f0d2990d763f74fb6513c20df6fc4df32f1d3eb9dde892cd02e
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs supports a pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://infrive.ru/uplcv?utm_term=arrow+network+diagram+pdf PDF link annotation
    • http://www.hgbehringer.de/img/files/files/wofapi.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/weragifinotoxiz.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/92341137966.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/l5klcc1f0hajtrbpta00an63i6/dasadilumawomibi.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/sopobekozover.pdfIn PDF document text
    • http://vecsecity.info/editor_up/xepotaj.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ab993a1f22d---jarelamivapulanoba.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8f732fd79e77a8126464cbd77a77cf11/2669988242.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612b45015a25f---sidujajobos.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/63668012365.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/bafozavapamasapuvofod.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ia59iqeqfnra6jornppccvf0j3/bofajerova.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b50a9fcf---51502314138.pdfIn PDF document text
    • http://wwstationery.com/files/file/nujikuxikatovawuko.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/kofimidonojiwigutaxunop.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/50107232997.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/631b56eb2475d97b256bb33e9289b104/xolak.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90f2937f4b---33222905844.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/ziwatibiwinozere.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/miwipigoxuwixezikaren.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/fexedut.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/57284359243.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/givamiso.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98cbf0941---20323592664.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2b87dc2a6ed20fa1c2b5bc15c054aa0a/94809392592.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_off0000cbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 10784 bytes
SHA-256: e4fef34b802c9fbc25aba6fa96ae85959beff3396edc0ab1c19d794251109741
font_02_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 17380 bytes
SHA-256: 80f9301c199e096a350f77702ff9c71d8b7868e3de71ce94af464604b0b77c0f

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