Malicious PDF — malware analysis report

Static analysis result for SHA-256 588375ac878d6492…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 15:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f98c2e083244e78c2b3095a528b91b9 SHA-1: 48eb22f8bef2bc6be201d39aee00d48724b428b9 SHA-256: 588375ac878d64922c878db927f5c0515c0969b6350cf116d709c97ff44337c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or domains designed for link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of links on compromised CMS uploads and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://philabc.ru/uplcv?utm_term=clear+apps+running+in+background PDF link annotation
    • https://soi.icami.mx/ckfinder/userfiles/files/99510730909.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/53148739437.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/tijoligudanesup.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/putefal.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/bigov.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/kiwijavufakonameden.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/92318321129.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/gbnr7hpn79n3pdfmusvkornofi/84772605596.pdfIn PDF document text
    • http://geotersrl.it/file/gozutikuta.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea2123fb7---82549958002.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/nevowuduxajosi.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/38474215499.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/fojapisoroforeresateni.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/17991349129.pdfIn PDF document text
    • https://ubranni.com/uploader/files/vopiguren.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/dumipafiruwagugezo.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/gezebasido.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/41451599770.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/87384895379.pdfIn PDF document text
    • https://mattress-leader.com/media/2026419559.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/jigiriwogogaxile.pdfIn PDF document text
    • https://dm288.com/slicice/file/69202166942.pdfIn PDF document text
    • http://dildendilecevirievi.com/upload/ckfinder/files/vojujuxiretu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16148af138ad25---tirexorasanala.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_off0000b60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60C 10956 bytes
SHA-256: 12517c7015d29d62213392784009511969cd75f7b605581ecb302be1f4ba7053
font_01_sfnt_off0000cf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1C 16952 bytes
SHA-256: d740f62115f4edf5f0eef270fc321e26354f11d798bca81346ee4ed07b728485
font_02_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1