Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d36a8b6cf8ccb0…

MALICIOUS

PDF

74.2 KB Created: 2021-10-08 08:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5ff57e08d591ab88219dd116b68f2c9d SHA-1: 53ceda18d8db6d04e0b6fbe60b72654f573cdda7 SHA-256: 40d36a8b6cf8ccb0f7659ca8b0bf43cee53d678e20992edecf7546535fb87a71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other potentially disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to direct users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613083c72fd89---pogoganuzisilagud.pdf In PDF document text
    • http://spartapr.com/images/upload/file/41269056612.pdfIn PDF document text
    • http://edituj.cz/res/file/kipemuribekibirosuto.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/13018427233.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/90098088590.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/wotowupatisukud.pdfIn PDF document text
    • https://artemishosp-em.tw/uploads/files/202110010323403692.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/31940101698.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1631918005.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/94254924055.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/nufozito.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/varixuleka.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/24975129779.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/95357389458.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/gavat.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613697f6646f8---zobobigalaxunagifamikeka.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/25587952141.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/onep90ldguq5rojok7ovt6uom1/65541297234.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/melomovebeka.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210905160322.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/femobofepowevo.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/jaxugotasi.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/39919271067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fun+electives+to+take+in+collegePDF 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_off0000c016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 16688 bytes
SHA-256: 2ed2eb1315dbe1725765ca0fc660a72ebaed658f8443be3fe01bf23c00f43aa4
font_02_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 10540 bytes
SHA-256: 4d68d4395ad66b52a905c083f431e62a495ef1dfe17d17b2e1d18148dd32957c