Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb12f0814b2be360…

MALICIOUS

PDF

91.0 KB Created: 2021-06-30 23:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 88a73e6b765e0fc34ba02618a185fd7f SHA-1: 6495dd154ea7af6250f2bccf3879af53a9b79e5b SHA-256: fb12f0814b2be360ee963d9e2befb1435666cb155ef5184f84558c097c0af775
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to multiple compromised websites hosting other PDF files. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in SEO poisoning for malicious purposes. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/o97rtq1mbae123lck7iiu8tmfd/bobazewivorovebima.pdf In PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a583a38bde234c34b574afdb0643055f/90708429216.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909a05e0565---zivewamaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609289e3be66b---75169087937.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c417adb3339---6021800971.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/50559680bb438e46e2b0488a2aaf1b58/14051508960.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d57b5878f3---ranajena.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/i1d9cqvsnqggn6rrqm696pirgn/18366189941.pdfIn PDF document text
    • http://novichiha.ru/pic/file/bubimitevitoxakifelupafu.pdfIn PDF document text
    • http://hotelsandmartin.cz/files/file/nupitedimafewurapexi.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6e3aea06a---47798825032.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/l18lpcpq208qn08ig4cc0o4406/48952615783.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af6ae257eb4---xexajotovekovijawimamiv.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/nafosebadexuxukufaxiku.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/43728125248.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a38259c4f33---57112382899.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872874ef08a---banasuxepopemumopo.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/866a5b316a40129652da77f3455d5603/lelirudotofirojuro.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/91737607688.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160908457e77a1---75942097797.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/17183160444.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/vawusujodedogit.pdfIn PDF document text
    • http://goref.ru/files/file/52053264323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+meaning+of+provePDF 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_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 19516 bytes
SHA-256: d25c1e68d7cac8088be338b034f89fa6100980f0aa4766ccd072894cef66a72f
font_01_sfnt_off00012d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14525 10520 bytes
SHA-256: 0198b1d91305f983832cc45e4882867bb221a950be059063f48537ab471b0102

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