Malicious PDF — malware analysis report

Static analysis result for SHA-256 320cfdea8e3e2e3f…

MALICIOUS

PDF

88.0 KB Created: 2021-09-15 21:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41981544589b40e7864a82de561424cd SHA-1: c4a2a4482f5fed2c9d548729b27eb0ff8840022f SHA-256: 320cfdea8e3e2e3f7b76231ba23685376a22e1e77c35a186987f96f91acc5564
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are flagged as unknown or potentially compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://gyliver.ru/files/files/kedovebowoputib.pdf In PDF document text
    • http://vzwsportenmuziek.com/content_docs/19770457045.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/lemozunat.pdfIn PDF document text
    • https://mkontroll.hu/File/84516726471.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/tevefomorasubeni.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/35435988558.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/18321988187.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/66001757881.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/zuxuwapubamux.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091514021473499.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/zanuvoxe.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210911_5D0BCDD432E35DC9.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/kozagixaretolotosaso.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed697bda2---63135286822.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5762d9be---59864603251.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b64eeaba9---94667329368.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/71802435996.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/gepanubezolugamumef.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/jodenukun.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/kokijanomitotedo.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/82352852332.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/jelasenazuta.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/tiliziwinogetasogifu.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/zisom.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/4920611772.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210907193558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+photo+storage+app+for+androidPDF 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_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 17176 bytes
SHA-256: f8274d5a000f0377ea4aa4d3bae1208fe33f4086d813bb9758a77c9d16bb5c5e
font_01_sfnt_off00012125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001393c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393C 10784 bytes
SHA-256: ae3a8fb348d3c5ca9609185c29cac7c317d902ab4f6605687aaaece58143e888