Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82ac8d389ff95e4…

MALICIOUS

PDF

86.6 KB Created: 2021-08-17 17:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93a94cbef492fe3ec74680d1c1641b79 SHA-1: 0e7c8736b00064e45d9e985bbf95de43ab550636 SHA-256: b82ac8d389ff95e4863bba7bb81312cf06430e49a8a3daeedec00be1c3f1c508
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f0d3f09280f9b270c65ae7e9cf397f91/xeledenanuwalutanoful.pdf In PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1314d7ab73f084fe8e85bf1a955f7238/valapetikibitoro.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/d793a2ddfdceafdc3aabeac86fff292e/jixunijed.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/52801434465.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078ba4dc3576---30328872215.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/10588615655.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202107160812251544.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/bixino.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161116dcf1eb19---75546132542.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/n6utk9287qm09s30vsuons47e6/fiwox.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9266f1432---zenowawefebamo.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e687441d7da5bfa43bfb90d503adaea/mabuvedavubulikesadid.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfdebf43476---30494014091.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/17833512866.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/jakokegubowu.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210719_DD4D79BEA03A7F03.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc92475477---17369977321.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/7352979757.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/sol0nltskpajktdo9n9q0m7ps1/wupalonavuzugebumugikape.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/mawobasebuwawonumababawab.pdfIn PDF document text
    • https://activepymes.com/pub/file/54053382508.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/80538754948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=como+validar+mi+rfc+en+el+satPDF 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_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 18208 bytes
SHA-256: d03c9df2b33e8c255139c09a55eb56bf3cecb8bc1654ca5d54ea8862145421c1
font_01_sfnt_off00011ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA9 10732 bytes
SHA-256: b18ac67dee8ebba7b863b799015da20392ee2e54ce86ced016310087a0ad597f
font_02_sfnt_off0001345e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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