Malicious PDF — malware analysis report

Static analysis result for SHA-256 41801d3031023b07…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 11:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49c0e0e2c68922cda05c6503336698d1 SHA-1: a6e354478bde50f6d9a3c361b239ef8bd3bbe253 SHA-256: 41801d3031023b077d6a0009ec068b9d7939513186e72ef0bd4c84529b693908
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of 'utm_term=sales+executive+job+description+for+resume+pdf' in one URL indicates a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=sales+executive+job+description+for+resume+pdf PDF link annotation
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ae8516eb38---podenuwofawogib.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/nivilamifitosojipig.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/supowob.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/xovejobexenun.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d33321b3b---komewolog.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/62063676959.pdfIn PDF document text
    • http://dzbnf.com/upload/file///28819934733.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/fufopedefezetijuvir.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/dafitabedakavevegufu.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83de6ae5aa---69841134124.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7b254b71b---94873999372.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610579bd9124b---60480464542.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/fedoxa.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/65497944065.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/renipikisagas.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/juxipalifanogijusozokavi.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/binipilumubegalaf.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f6a591d99---lekobagivedu.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/wesajodizimebasidedemi.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c03f62bda83c5c76caa033d5bb283957/kotifukuliniwoxabigo.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/66013252207.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210707_AF3029C192E91DF7.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a34e1e2fc5b---pegalawidak.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/78305471722.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/15233830190.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_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 11396 bytes
SHA-256: fb05d8432eee8b03d203b77373970ebe2093b820667690b91f10a4be21ae2a6d
font_02_sfnt_off0001120a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120A 17520 bytes
SHA-256: a6a016759b07cbfc3e35e04144eb8c0457555641b28bf972977a8e3aacabfad6

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