Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fe12a929059d05…

MALICIOUS

PDF

86.2 KB Created: 2021-08-12 15:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a9f02aad6da558daa3d9c8c3b788544b SHA-1: 01eb7fef23bd808389259f062585d1c9a4900f87 SHA-256: 98fe12a929059d05459406f0a617441703fb2c703044fe55061b6a07d332161a
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://lifetides.ca/cambridge/uploads/files/29533333688.pdf In PDF document text
    • http://salon-urody-bellis.pl/images/file/82566856177.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e52c3df19---werumibujatomajabodukufan.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5258d2e5a54d760fdb0fa23f853597e3/31975983366.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/9iau6ft0u66knqesols0mjn114/bomuxixub.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a3026f07---84264454437.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ldmn4jfl572tpp77q786d9c552/58813768564.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085748b81560---xelopilupatame.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/24749505704.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d093d66b5---29032315717.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/janusozole.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/cf2df0209227b9a5c9e6c71ac7d6121c/37899839196.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/ba82c06cf9c77b4f0dbbfdeac1253556/jazuvixogamesizitepamu.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/55497027727.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/vesafafufade.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9gd5dur4suusvi11881vn02lj4/26336757878.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5faf91f853543ab8e59792cc9334a210/51829409860.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/932to72icuf6rftisg23nbihl6/milupewuj.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/teduforek.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b312f5c01b22b02b953c2945b3555ab0/guzekotezefefujenepe.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/vomugalamesimowus.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/tejojune.pdfIn PDF document text
    • https://chp-travel.ir/data/file/50808889832.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7d1b0d4317eab537eb30c9b4b8147102/wojawediruforagixejik.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/rmmo10umf308jq5s5iauman7b3/relur.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/35135105872.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e3be429f4---xixukozoxebemefexumudot.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/16935647575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=aws+certified+solutions+architect+exam+questions+pdfPDF 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_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 11300 bytes
SHA-256: 678b557c3a2090934cfde74a7d210847680f82f9bdbcafe5f40aa9a5fbc072f3
font_02_sfnt_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 16648 bytes
SHA-256: 6f1c5629a3b939796a30ac29ab5b786fa53593e4b30e99cf874a1b255d12a7b3

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