Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf286b60c02e963…

MALICIOUS

PDF

75.1 KB Created: 2021-08-31 09:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47c7fd962de46a350216982dccbb6528 SHA-1: 3fc679023181f5e3ba035c82d0ef62b62821c359 SHA-256: adf286b60c02e96307035009442b1070a911d2a62966d4b4a7b17e39243a0b12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of multiple links suggests a link farm designed to redirect users to malicious destinations, potentially for credential theft or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=150+divided+by+5 PDF link annotation
    • http://driver-jazda.pl/upload/file/19428836127.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/pejitubozex.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/84765505706.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1121d81c3b---69544859327.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/barotodewupajobigiga.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/xofuregipapemo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091294d1de80---kosezobakefeje.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160f55fa03b3f9---26914753640.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b4ee0274---77570516442.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/9266479929.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161105e25e765b---50723101864.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609829e611bba---88952710728.pdfIn PDF document text
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/wigulabokenidan.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/direlakegovemivekade.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/80f7b09734ec95399447df7209121536/ragikitaje.pdfIn PDF document text
    • https://efnnma.org/files/file/ziraxedofulaxividisujemox.pdfIn PDF document text
    • http://bg104558.agchost.com/userfiles/files/17696687164.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/cd678456986d74dfb374ffca8b70af54/39910223314.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/61614647044.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/97d36bb7e1ffd7edd38acfb9610e167e/47487962038.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/bo7m29ju8p9igap6nhqqb9o5m4/5386495792.pdfIn PDF document text
    • https://baongochoa.com/upload/file/52406653792.pdfIn PDF document text
    • 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_off0000c3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F3 17600 bytes
SHA-256: 38a18e94f043453891ebc8bb895e80bb5a54c283564d203e47a7d3c915348645
font_01_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 9972 bytes
SHA-256: 381c4668cc6484da2a318a75f27757426c4d2cbce9e3e3d0dfa87053de2861e2

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