Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b236a68b1f99ed…

MALICIOUS

PDF

94.5 KB Created: 2021-09-03 13:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9c2fc9a603a71eddd35ae8c0bd507353 SHA-1: a513280584aeaa4c36a9b589e9fac81dd218ad9b SHA-256: 78b236a68b1f99ed6707b7f96c2ee8f472f1e0e03f71806a23e305c99d29a74e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://web-news.eu/www/pkpar/userfiles/file/80166609010.pdf In PDF document text
    • http://valsadindustries.com/userfiles/file/vufofalumujiteviselilifi.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/811vtdtoplre5np1e8bm326r17/34398709285.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/wutofiler.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e082a1647---34053511948.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/87217746845.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/tipolofijedaziluwa.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/76997132512.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f236a0bddafdc77d1bf124139d0c08eb/kasizitedit.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/vijagoto.pdfIn PDF document text
    • https://virker-ikke.dk/files/fidogenobababefofeta.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/152350423590.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/75326704287.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/mi4cps86lqaqdpr1glpsb60s31/37228065230.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/47e1ls2ngr2o5ao069gtuthfta/1560552678.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/sajowodorawufoxebafubines.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2jfasiq04afcmnimeakm4ips04/zarutagolajomobuxumad.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/kerugowag.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/66544247274.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bd20df1dc---49465783582.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/mesogogejitasugugakipege.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/fufasanepixunanepegelow.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/72418024284.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/kajezumumutonag.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/f2tt2162k8nemrpbhph2qbbek6/kawomosizumiten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=vademecum+homeopatia+pdf+gratisPDF 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_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 21604 bytes
SHA-256: c87112fe54d22ad07732d2162f12a67f42fb151de8b9b02ed829dfafb41823f7
font_01_sfnt_off00013a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A67 10988 bytes
SHA-256: fc075036bad5a7ecf3a2755201b0eb5e7b1b738793b7c3b7e3ee9260ddb2041f
font_02_sfnt_off000153b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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