Malicious PDF — malware analysis report

Static analysis result for SHA-256 c501c97cd9eeb10c…

MALICIOUS

PDF

91.0 KB Created: 2021-08-25 03:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01f7777d64eb3fddc484e827a19f69da SHA-1: 90838734ba3df6a2440ed678e3e584ee8c054713 SHA-256: c501c97cd9eeb10c812db3442e24b78eaa7b1bca3cbadf019692a8266586d3fa
164 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs hosted on potentially compromised websites, designed to trick users into downloading further malicious content. The presence of multiple PDF link farm heuristics and the detection of a 'Phishing.Trojan' by ClamAV strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/fufujakufenireli.pdf In PDF document text
    • http://mashtalkandil.com/userfiles/file/lidizizulikidivirakom.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/vapoxu.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/13917213720.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082cfa75bd0f---87882201927.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161068ef47cc1a---81677441470.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3113871dbd---41039275451.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6f84bb5534965c1c1622e44d2fec7e97/befozibubusod.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/lb9f3p02c1od10tnlfola9qmlh/72694264913.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161155e2f8667d---vunipawedematufule.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210804041521227787gxj9b1.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/81499659110.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/bexolefexeganapoto.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/327b3577f34b027b37a9739de52532e6/13846710639.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/92647394620.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210808230257.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af569e85a5---gusolojawapesuze.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m9i7lolgtfl7nulupugjhhtof1/24989564731.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812b525b9b1---salilurafubegaxuvotowa.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/gurimamoteloweto.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ps90t3vf5fg7nac4du3lp1baih/wenefidadavasusalubixaf.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021710818421058.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1e9a828b---71779418368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=paper+boat+by+rabindranath+tagore+questions+and+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000123b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x123B5 20080 bytes
SHA-256: aca991c95c772bce8f305bb8a21115b585e151f33260e0ad29ca6373ead246b2
font_00_sfnt_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 17268 bytes
SHA-256: 6bbd4d376a78dc3bc30c7e536d4b96ad9b3e6b7fa2063d619e23f05e7726801f
font_01_sfnt_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 11212 bytes
SHA-256: fa5058e0dc6b05909fb4b84b6ada58ff40ef14e9f5189f8ec026c41eb07303f2
font_03_sfnt_off00014540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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