Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d6a8be68eed2b6…

MALICIOUS

PDF

86.1 KB Created: 2021-07-07 00:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ffb0a8522b7ecfd808bd90908d7f12a6 SHA-1: c1a697f2cdc05fccc865274405b64ac874f7e10e SHA-256: 33d6a8be68eed2b6e9968dca39bf29dd18241c6e610c23ef36e87f3f84738c2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of multiple external URIs and the detection of a 'link farm' heuristic suggest an attempt to redirect users to potentially malicious content. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=north+america+map+unlabeled PDF link annotation
    • https://its-bulgaria.bg/files/file/kibinofabaladikopokiza.pdfIn PDF document text
    • http://modero.vn/upload/files/zusemosuw.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/30427938541.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609849532c62f---82434366134.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/jizezevuvubuwojebiwezili.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/pivojipax.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/39508820992.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuxamepekamoni.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/roxividuwowake.pdfIn PDF document text
    • http://daydala.com/userfiles/file/25649193364.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/3275bd7939b5073376bff13eb6bd922f/buxopuvilapopiganezepo.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4317245c52---jalolekiradekivakuli.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca73a0f51---34807443468.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/berawap.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/d7f35b040440ea043887f343090ec0aa/39460316995.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac73bd9fcac---3855743959.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b42e5f4dc0c---besigosiguki.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aabe8724e88---gulipe.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c5dc57b1f70bd6df59beb8af275be0fd/jevepitusaxawoxape.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/h2g8e9n8mhguibb345n1lmstii/febotimapefedamiru.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/goxuwomen.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/wujupurenezugunakuterubu.pdfIn PDF document text
    • http://www.77ice.com/upload/files/rawipib.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/3h7i04hjca4le3ot5l3avpl622/86796888807.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/4kpdd1bope9csu7291a653mpv1/95102279836.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_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 17224 bytes
SHA-256: 251b45ecd80f456babe16b66a2e4068a99af88e9f675a3e4583eaaa1baa4507c
font_01_sfnt_off00011939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13150 10828 bytes
SHA-256: f8e59ae59bf01233f15f0fa2de7ac2b568d47329844fdfadbb37d1e551f861d6

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