Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbfa2a1cf1dd528…

MALICIOUS

PDF

85.4 KB Created: 2021-07-03 04:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 43e48d16ed64a56ee9875b03e1104027 SHA-1: 07810648b5e9a2d7eb289950ba2ac3f7d393d9eb SHA-256: 7bbfa2a1cf1dd528dcf16d8bc221369e0b66aa901a94aa3aedd00a434b821378
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites, suggesting it is part of a link farm designed to host or redirect to malicious content. The presence of a 'download button' heuristic further indicates a lure to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ccdecb463d6011baf745c8f39f5e8dd/3523394832.pdf In PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/juwoxunuvu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608552a12ecf7---43804538203.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b8bc219e0f9977d056b74e8cb3de8371/88923285935.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d822912cb1---jusote.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e64f235e98a4b228c2aae9fc4f6516ba/62664702551.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/rosikuxawazomaposevarowi.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/12672393716.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/430a0250d28240d6a9d99555965e8401/zagaso.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/20376111709.pdfIn PDF document text
    • http://changdahk.com/upload/18816893437.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ef921f5e3bf4446e23f109963ab17403/fitosininiluz.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada45192b94---67605498539.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/sokukarolemafira.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/paride.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/f0uvknq6gah7knlj7kvgthkjfh/35992211800.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076919a62534---10607077148.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nidapitewozemirijitakasi.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/febawejuwitafipeguxoboka.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/63421321863.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/41809420792.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094726c8157f---wugefiv.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/61287354752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+creator+for+androidPDF 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_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 10256 bytes
SHA-256: aac616590c58c5cccf1174dd94ed973b3925a82905234868c15c70f1a372c7a8
font_01_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 20100 bytes
SHA-256: c053299da8ffaad2fc945ebd72b4dd2f04ad92f1e5dda9926a039e5bbb0e12de
font_02_sfnt_off000130b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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