Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f71fadb0feddd7…

MALICIOUS

PDF

69.1 KB Created: 2021-09-19 06:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e86ead31f79beb4ccb0806bc69b5b4a5 SHA-1: 0156b02af07e703897194855a70f37b1735c57ba SHA-256: f0f71fadb0feddd73c3dcfdc77707bded0a14e75e2107ee3796e5b32a6185c69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, with several heuristics indicating a compromised CMS upload or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://logicamail.it/draft/media/dipomowedibugekopomeriba.pdf In PDF document text
    • https://angkalaris.com/contents/files/gerotobadejedum.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/85510510009.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/57068325001.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/lazavuxodirudijidi.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/vizadekijovilugonokudo.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/jutosixokumefej.pdfIn PDF document text
    • https://sapporopools.com/contents/files/dusisuzaxomonatunagire.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/2369838772.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/181043535059.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377c754c990---lafifatojom.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c853e88e29---73823556483.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/tolofogewuzizadutawoje.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368d71b064c---87214255278.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/gadatadukupikodi.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210917160835157.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/35327157124.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76505ae27---96634217943.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/57682877466.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140931937c83---10984259865.pdfIn PDF document text
    • https://airbays.com/userfiles/file/pigolutudawobazimugaden.pdfIn PDF document text
    • http://vlajamo.cz/images/file/wevixukanig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=free+download+need+for+speed+no+limits+mod+apkPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/58917184761.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_off0000b1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D0 14420 bytes
SHA-256: 6994f534b3be18d5ed5785eb89dedeb2b6f87210673b4e9526e32ff0ea464521
font_01_sfnt_off0000d5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C4 10816 bytes
SHA-256: 63d27753019c83b096c7f7c5956659c07b5b22c50bf924a7b00c82a6eac8f849
font_02_sfnt_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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