Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86fdabd7dfc76b0…

MALICIOUS

PDF

87.1 KB Created: 2021-06-29 23:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 116855a2fc3956823573617640e455df SHA-1: c546a877742a7154510ffe62fcc9341295ea6c42 SHA-256: b86fdabd7dfc76b0e6f6e94e23f1defa8515514abc5ae3a72a9e53b8017093b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or other potentially disposable hosting. The primary function appears to be directing users to external malicious or compromised sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/revikujarenasukukevevu.pdf In PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607e56d7718f7---boxobinifisunebegoboze.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/xekorewedifakapenunileji.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/33423277204.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0ed49f104---20268685605.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/xiwiretolewo.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/mudufipulufa.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/0aee741f41c1b2ac25908958ec2705a6/fofisepatorisugufesumove.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/46285573834.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210607083828.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4872512a70---luzixazubugesemagijiv.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2cc483595581ecf6e79cf5bb864c830f/pupijanonino.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094307c11cbd---wujokodajikitekazogenela.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/37338885528.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/58fp4socek8smvm87vgj1k4ft8/nekijunedijuzigogejadegi.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160913f841474c---fivilonobupaluvob.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/479c4594b9d9dc5e1de2db9e0cd59160/sipowezogemomebusuvix.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f03af8e2ab756b165d6c6c98cd5c9e04/78196211413.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/nuxofokevisodi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160987c17d4f56---6223992993.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608598aba322f---lotekepasofabosamade.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/92509457202.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47678864023.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/kaxubu.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/1rfvvqkqdolirhf9hdfvqne69d/5873726830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=there+are+eight+planets+in+the+solar+system+lyricsPDF 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_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 17696 bytes
SHA-256: df56d935d3df72b63e8dc8825d1d8ea9b2763f6793795ee919e9ea09c4b1e6b2
font_01_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 10900 bytes
SHA-256: 0f2183465228a83c24e3a7007c0089cddafbc7d2e75ba91fc6e051dbb28dfdfa
font_02_sfnt_off000134d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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