Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a7c61d1edda540…

MALICIOUS

PDF

79.3 KB Created: 2021-06-21 05:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e758118b77ebf5eec1d9ca2f87965fea SHA-1: 6871e890519dfef1f5fece863af532b1197b98f6 SHA-256: e1a7c61d1edda5402ff610b982844bf7b22b664b97d4c4cc33b4512d9567263a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, utilizing SEO tactics and pointing to multiple URLs hosted on compromised CMS uploads and disposable domains. The embedded URLs are designed to redirect users, likely to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/11f6d77c9c32d3f1a4e6bf43904b7ac4/27655455660.pdf In PDF document text
    • https://ekransamara.ru/files/43870739995.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/pojofawexawatetorud.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/gepoxafema.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104300100053921.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc16adb334---woperefevapekobenife.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/34240652254.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/98776701997.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/roxuwi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad7c846ed---5410521109.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/247489627f29b589c430c56779299da5/73571204442.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/wukebafajomijod.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/3722761086.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/04ebsnake5r9ve77i69a4r2ho8/dizagoguruzazeniwerowuv.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/paof4gpgboi1n67tb9oiiepel1/8624842140.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff4157bf97---84231751383.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/e6a9f5d475accf747a57b0e04bf29389/14169483995.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b700dd762a9693c22de8d012ff2295e5/rabunolobukudimo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+revolution+online+articunoPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 3900 bytes
SHA-256: 6863e17a91767913b01bd02ef5d1fbf0a5586fd230731056e9ecc70e37f6ea6b
font_01_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 4892 bytes
SHA-256: 36578ed35a04f3ede36e73ae7d907c4cfa836ca402a68b87dbb2ec09d502dba8
font_02_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 12936 bytes
SHA-256: d71a9295fc8fccdcbbee026e822e2f2f61f0e1c8cf93b5b25378c616369bfbc3

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