Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf47a94524a87d1…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 02:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cda5e80fbc8b70fb077fe180d01087ec SHA-1: d71f1761ae0b4e59d59bb546307cd67b675ab758 SHA-256: 3bf47a94524a87d17240d1ea830c522dd0837e328bb6d82d29b1820fffae51df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to facilitate the download of further malicious payloads. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infrive.ru/uplcv?utm_term=kissing+booth+2+download+full+movie PDF link annotation
    • http://terminsk.by/pics/files/radejitamipunowe.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/xexidedid.pdfIn PDF document text
    • https://ibericadearmerias.com/file/jebijimem.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8376aced079c1c71c63df890004261a2/87626059418.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/8870474890.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/zumupubegowexifulutiwofe.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/17663250676.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/gavajezobufatizos.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/23079091136.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349a2c79cd0---vivofukilafaradirubisoji.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/simedem.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///saxososasunoroxa.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/59807535397.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/35841566659.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b43a784d4---napomepav.pdfIn PDF document text
    • https://agrando.cz/files/file/toxetevibomujalixeje.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/lowanajagij.pdfIn PDF document text
    • http://preiss.at/upload_files/files/88248639039.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/sojonugifodow.pdfIn PDF document text
    • https://premiersuli.hu/files/files/25514784372.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/sokul.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b66633e57---23908410669.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_off0000c495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 17452 bytes
SHA-256: 200f697d2368a5a7b0dbe991eb677b22ab237de56819172ca20a4276f9d88e6f
font_02_sfnt_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 11204 bytes
SHA-256: 2c96ab87ea99f1a121559dcec2647d84e0d6b552b28b35387fca5d83720044d9