Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b6c9dcaf439f1b…

MALICIOUS

PDF

121.8 KB Created: 2021-08-16 18:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 994f0f16134fa57111843d83dd486395 SHA-1: a2207e16f207efc7d1d3743631b3b43bb574c8cf SHA-256: c8b6c9dcaf439f1b39791cda284540ddc985a45944954213125eefc8c1ac1489
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://thanhlapcongtykiengiang.com/upload/ck/files/pigoniworelune.pdf In PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/tarekefobanur.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/zovapufilinofovu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160828a318cf39---7338230511.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/61389060823.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/mp10d00djlm7kpb589ql1mjs8a/24178679199.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/jugimeda.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/974cfe92a716ebb4e57bc5b2409f445b/44220332671.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/rikutu.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2257ed916e01c7ea5fb51bf3da1b6f13/bimigexokogefukulexavage.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/bepebox.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8ea18ea17---dulowatobosagisip.pdfIn PDF document text
    • http://fxmeat.com/upload/file/233add2c1fe42e8b0f6c230ba9224921.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/88128716232.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a6d30801---rodafuramaluxefofoti.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2dd0ad477edd76f611d2d5419df2cb03/ziraxijo.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/30431774664.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/dumekulujerowazedif.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a8608868f692e023bd61a3a5b47531b2/48460079659.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/jajoxinuvofafijisukufasex.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/1248124185.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/71584314735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=far+cry+4+arena+rank+up+fastPDF 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_off000178d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178D4 10576 bytes
SHA-256: a13368a365fb5222bc4ba8ffeb7aaf50cb560ac8bd9f048f57a031b381c1cd7a
font_01_sfnt_off00019131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19131 18132 bytes
SHA-256: 510910af4848c06ae8fb36fbd9e9d06db982d2d3a47d1a5c614c82a730d4e519
font_02_sfnt_off0001c0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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