Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2a9940ece4c1ca…

MALICIOUS

PDF

94.6 KB Created: 2021-06-26 09:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e7a133668fa8b801081eabe0c298fda1 SHA-1: 964011ff24f74fe4851590af197a8165dc8643f5 SHA-256: 6b2a9940ece4c1cac4575fdc976b8f85b1abf3e086d7fb7ee57ec7670be1faf4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites hosting PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e36b3297---14891893980.pdf In PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf55d13bb9---kedelubokiwezum.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/bigid.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b08cff30609---27765768579.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/tovinoritegivido.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab384aa247c---11812712109.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc3f0a54a3---podetasowunuvutedupetezub.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/17458968285.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/pesekigogesuxuka.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/00cff00a037fc2cd65cada5b9684ba02/silaboganufiwovewitim.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/je2eu2pd3utkiho04dof2u2cbp/tanarilegeduwuxirazapem.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/88701924701.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081e0979a13e---72412111890.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/nesajot.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/v5ibn9tjobfn0v3m3v6t8l80d4/46255618084.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/rolagotidusuwez.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/e234110c582d7f7286efc1afc953dd4b/faromogalefibep.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nibso0m34fd32ohbhip0c93m13/85986667271.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/84mmr7lrfsuk31gv7maiebos3p/zegoxirojeve.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072002e92ce8---bidemesoguwoseduzo.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/zitadujazutuxamego.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/fikutaroboletelabibijamav.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f119520a05---21730494873.pdfIn PDF document text
    • http://gyobel.it/public/file/ruwitidusefote.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c17c5ab9475---feloju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=global+top+100+companies+by+market+capitalisationPDF link annotation
    • 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_off00010c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001245c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245C 11096 bytes
SHA-256: a7c1da716d43800f19d757c2599bd1850e330f57f7aa9d288e59acad9a552822
font_02_sfnt_off00013e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E14 18028 bytes
SHA-256: 88d8202a3ac61fb6a43f6f08b8dd7982671396b426e992ea1e93251575957b6b

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