Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb492ee2aec6d99…

MALICIOUS

PDF

76.7 KB Created: 2021-09-15 10:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c965fa3fd36f1349c3abd520a58086f6 SHA-1: 32827b4ff30c40d2019e13d5d42dc6b8adad110b SHA-256: ffb492ee2aec6d99be337c35adb722bdf2ec4de6dbb73d4ebc129e06c583f0e0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to various domains, including compromised WordPress sites. The primary URL, https://wastran.ru/uplcv?utm_term=playboy+game+apk, suggests a lure related to gaming or adult content, likely leading to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=playboy+game+apk PDF link annotation
    • http://haki.vn/uploads/files/tifafigopugewu.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/65620759314.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/53305841264.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161413fde6e060---17218039143.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/93258377575.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161412708af4bf---suwusuribovenal.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/redexumimozet.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/piwutewuninupafutukefil.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/51412476864.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/betovexenetato.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/29184288020.pdfIn PDF document text
    • https://5udua.com/contents/files/xipokepirokiwekan.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210903134618-wutajefojeletasepajage.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/62190727647.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/90156376971.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/vigenaroxobi.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/gusenorovesiweza.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/68018717365.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/91519620027.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311834804c0---66495438698.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/60985045668.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/5604435392.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/jegutarinubo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614137e5f3635---kevoneg.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_off0000c885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC885 17720 bytes
SHA-256: 2f9f09f0b90b858813c34624af00bbd10ed07cade80adb90d82243b2e2a021a9
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 10380 bytes
SHA-256: 754db4ca6f3c0cca84f0555827764659ec52ccd0cfd65f390ac4b0a57e272dfd
font_02_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1