Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb3402aed276786…

MALICIOUS

PDF

95.5 KB Created: 2021-09-08 10:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f5909c0e9df811e58488daeaaf75d84 SHA-1: 3f03ca379af9821056091994404ee353663e22d1 SHA-256: 7fb3402aed276786b6de25ce91503b1eee1c96e7329ccf4c48600dfaee561bcc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded links are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://mangonebike.com/uploads/file/rixesu.pdf In PDF document text
    • https://questyme.ca/userfiles/file/gizefopur.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/linemawubil.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/gewogugerugokejere.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/gefadegejazemoluka.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/8f1b5ae818896e048cf84b74f458c185/97720441122.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/076892ce6d618e4f9b1f314cfd8feffe/29819887715.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160941fd6dbcb1---96462380524.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/nixeka.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/pawokozibirokoredurozuvo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c054c3d60d1---61888463926.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/xetenedefevodaj.pdfIn PDF document text
    • https://wavemed.it/wp-content/plugins/super-forms/uploads/php/files/dd7b6fc1f9d809ae6a2563a392f8b18b/5610353493.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/sonupo.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/futopepedagujelutununik.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/47875913646.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/71728913085.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/danores.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824ad0821d4---56233263827.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/padulotimidavuvukabug.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6f67e997e6435fc5b01816467dae9fe7/6813693177.pdfIn PDF document text
    • http://palami.by/images/file/48620240895.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/goxubefuj.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/66952519558.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7350498610---xijunoluxaxupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=stafiloma+kornea+adalah+pdfPDF 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_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 10760 bytes
SHA-256: 48a7acb30698ce7720498b47aa4ef527109e68811dd84fe20594864b487531db
font_01_sfnt_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 18264 bytes
SHA-256: 2991f45c21599dc412c5bf1d25aba85aa2dc1d714a791b6abc041350256a102d
font_02_sfnt_off0001589c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1589C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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