Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf1800d3a2f9321…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 07:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c73fad48080b81af70d55a973d7a818 SHA-1: 761dc75d30a626467b13015fb63e41aa3e31a71d SHA-256: bcf1800d3a2f932131818655b17adf706846beadf39c375ed9a3dceb762dab2e
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 numerous external URLs embedded within the document, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=reformasi+gereja+di+eropa+pdf PDF link annotation
    • https://luminex.pl/upload/file/9425086229.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/060642346020.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca825955f1---salezopovema.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e59cfd40c3---lotumobakozokivike.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/14608c15b4bd27512cdbeb67fcd6fc75/30850941925.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/nuduziwag.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/83874831636.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16121353b30db7---48634641453.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/fesiduragogofepoxawofisag.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/56985481783.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/55310570582.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210628_949498E3D96D14AD.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/29907419885.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/61360785957.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/benus.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/xotusir.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/saxunamezidofo.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/betoxuwutuvezefep.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/62748549060ee33f1d94ac.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/1356442093.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e095fe9d6c5---gujigofoluj.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/9fe37a8ad012bd06efb9caed5062d5bd/lejeximitikin.pdfIn PDF document text
    • https://arerp.kr/data/file///48032539459.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_off0000dd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4D 10768 bytes
SHA-256: 9ca89796ff22cf95e929014b9b49b5d55bdab58aecd287e0024e9ae13b35955d
font_01_sfnt_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE9 16664 bytes
SHA-256: e4ff08f203d6e6998b34fe52a853ef954789f5b31ee66d78f861a726e21cc468

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