Malicious PDF — malware analysis report

Static analysis result for SHA-256 348c2bb820f7a3f9…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 02:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a9b6277405af9b64a47acfba2d1bf66 SHA-1: 2e61169af7b7df1c8a8a810687c7092a63ffa23c SHA-256: 348c2bb820f7a3f936ab72e3377b2f07fae4cbea39e0ddaf47c67704afa04d8a
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phishing lures. No scripts were extracted, and the document body was unreadable binary data.

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 http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144eb785227a---nixavexaxoladenaxej.pdf In PDF document text
    • http://mnwebdesign.dk/userfiles/file/jujakumom.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/28788484648.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/73557825481.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/78021027520.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/78656444207.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/dosesutasuvutij.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/lawiwematapetukam.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/zimab.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/bodadugazofemusijemavuzet.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/793387815555a9e39e770dc0e3a97ab2/defuvosutobovapumorejijab.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/30154518345.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/rajatu.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/62920337986.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/19/47697289082.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161451ca14ab5e---zelimosiga.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/23588951707.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/jusum.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/19062858537.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/tejozenulawesovosukus.pdfIn PDF document text
    • https://12waktu.com/contents/files/digakerabu.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/89024284260.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/vexokatitil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=leprechaun+gif+funnyPDF 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_off0000d5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E1 10496 bytes
SHA-256: 4023bcd1d2d30f687d2d3bf59b7d4f95c36fa44b56e48255423bd5d9b35e7796
font_01_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 17344 bytes
SHA-256: 25b5a4a93d5408bbc7d9e5ac39a42d088e4ec4c21405b197fae1d5be0ed7b39e
font_02_sfnt_off00011a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1