Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e54e412ecee1578…

MALICIOUS

PDF

91.4 KB Created: 2021-09-13 06:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 807ec0927fd89c0c9d6bdda42e729dfd SHA-1: 256e6ac06d6fa2be88f107ef8da12f23a72c0424 SHA-256: 1e54e412ecee157899de7533151c3be91a578a5024f59ad0729696cd49d9a8c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://kovovyroba-nosniky.cz/UserFiles/File/20278769551.pdf In PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/vexekijaj.pdfIn PDF document text
    • http://schokofontaenen.de/idata/rodigun.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613184f245695---dejezipigod.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613956b15da23---vazolud.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4aea4e23---tefolimude.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/japutiremifatebijabum.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/30062719038.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/pagininuso.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/96014190920.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/rosizegevo.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/25853264808.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/nepidumed.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/vewegokut.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/84093319821.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/50799971238.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/vaxufifulijuzokikajexagal.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/21413165094.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/taxesupozodejizi.pdfIn PDF document text
    • http://mrybalko.ru/files/3726095005.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/83226941946.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/33105689180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+walking+dead+season+10+full+episodePDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/9797799740.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_off0000fe68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001167f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167F 10996 bytes
SHA-256: a5e48047ea2a339a785867b5651c8da717b076559947a93e1d9148d7f2a0eb00
font_02_sfnt_off00012fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD3 18564 bytes
SHA-256: 176df88381f277f85d38c7ce38017f0a9a114073375e04aa538f81c96b01a159

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