Malicious PDF — malware analysis report

Static analysis result for SHA-256 0113e3f7c345f830…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 20:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 509df5d6fbff6450a9651b377cf566cc SHA-1: edbe6f085b3328457a3b3413ed39e1a28a9a7ecf SHA-256: 0113e3f7c345f8301001d21c32b60c515ab6b61f2bd12367fbdf0c9019a9e8c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. The document body is heavily obfuscated, but the heuristics and URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=fortnite+battle+pass+free+v+bucks PDF link annotation
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/m1mn5o3vje81u0pampfmunna74/kipanujafer.pdfIn PDF document text
    • http://uhorder.com/upload/files/21420967558.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/42667430971.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/98818437987.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/74500688957.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/38777360413.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/jogimuzaxuwokanarosujuta.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140247b38bf7---xasifarumegigin.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/5877140350.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/78091495347.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/pozogarabeda.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec96fc2865---72817618653.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/54310018944.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210908152429.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109150506171035.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/tikofonemukane.pdfIn PDF document text
    • https://highrise.pl/file/91982422856.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/47712842331.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/rikomudalikemurewevi.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/xotegadusuribiba.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131b76f69ae2---xobatubivumugerovumot.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/32de4222d05a6e696cdb7a3d6e771011/61447558899.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/ludaw.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/jasixudaxasim.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/40122072763.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_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 10848 bytes
SHA-256: a13d24f6eb22b9ff2c95bd6b91532d6421315a9d9076e9735ad161edbe02c503
font_01_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 17004 bytes
SHA-256: 0db06f895c0669d67a0c0972fe3142c0dfa20a469069b4c708b90b0a220d165b

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