Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ca3a010177155c…

MALICIOUS

PDF

85.9 KB Created: 2021-07-29 23:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9fbd767e70afbf4c5e936dfdc2937aee SHA-1: 5629fd380f9093a43b6d5cd2e8b1bc566ff9994a SHA-256: d7ca3a010177155c195265d952a8d3c8c98c5688dd89c78915a2f312375aa724
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, directing users to multiple external URLs, some of which host other PDFs or are hosted on compromised CMS platforms. The presence of numerous links on disposable or compromised hosting suggests an attempt to distribute malicious content or phish for information.

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 https://dafelia.com/files/sexin.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/5d1e44f3b2c3858141927d12e05571ba/tukin.pdfIn PDF document text
    • http://bjjiffy.com/upload/11079105297.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/cb557bc03a0feaffeefd96537da99f4c/nugivu.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/6278502815.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/mekesisumugexadijubiwusov.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210728_001700.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/xifodufunagufin.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/spsif7pbggqmmblfhaf64gsqdb/pipogesetezewupor.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/xikekiwedojilinodag.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609477dd7d7b0---tamade.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/2f9538509015aae8ea9374a5d7e73742/riruxobovudibepa.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/02765f7f0d1883b5b127e387b08219ce/1887738844.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743597c91d5---75050758459.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/54f5250aa5a96c8b5f86a1f3930cecd1/nonotululo.pdfIn PDF document text
    • http://alptw.com/images/files/18008055275.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/76a35057bcfdccafba7bfb8eaf1de94b/vubibebuberax.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/34584522489.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/fuputupekage.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ln2h69b17ki9pfrpflpvvpk0m0/53768748467.pdfIn PDF document text
    • http://fructusartis.com/i/File/puwapuju.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/28274978652.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609442415f22e---dawamazowurajom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+test+vision+with+snellen+chartPDF 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_off0000ed35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 16976 bytes
SHA-256: d1b69b42f93189677d2d34a61f6ea75b363e08fc9b7d811ca770303a3480cb71
font_02_sfnt_off000131bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BF 10472 bytes
SHA-256: 4c47dc411b37c475fe9ea6a1fca0621f2aa52149d362351214c9506eaa73c50c

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