Malicious PDF — malware analysis report

Static analysis result for SHA-256 758d27abcf8514c8…

MALICIOUS

PDF

86.2 KB Created: 2021-08-31 05:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 585ae256da74d96235a5b9a655291ecb SHA-1: 668b7909cf9ba19b2da411a015875c47ed33c55a SHA-256: 758d27abcf8514c8a4b9c1be808e30b77e22494bd56f2a85efc7607d4170b37d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. The primary purpose appears to be directing users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=is+magnesium+a+pure+substance+or+mixture
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/495ebe47b039e3ac7b5f27120ed4452d/xilusakatipe.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7f03d1c63---65047744912.pdf
    • http://sieuthivatlieuhoanthien.com/upload/files/20236922351.pdf
    • https://travellifeafrica.com/ci/userfiles/files/6446889200.pdf
    • http://arniestribu.com/campannas/file/rufefalomanaxasamu.pdf
    • http://mrybalko.ru/files/17658194119.pdf
    • http://travelshops.pl/userfiles/file/28967587339.pdf
    • http://moneymaker-gold.de/files/bubetiwo.pdf
    • https://luckysurface.itweald.com/uploads/files/6129249bdb30e.pdf
    • http://vita24h.com/uploads/userfiles/file/1641931943.pdf
    • http://onlytech-tunisie.com/userfiles/file/31461789866.pdf
    • http://doremimarlikinsaat.com/userfiles/file/zologozotoven.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/3jj3ds1lf1j0tiif6pkeas42a6/gebawuvusobarotikopixo.pdf
    • http://businessnavigator.in/ckeditor/uploads/files/lanozo.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087a4b83d517---3955461150.pdf
    • http://garmaclima.com/uploads/ckfinder/files/kakotake.pdf
    • http://sellmysayarah.com/userfiles/files/64168997029.pdf
    • http://banphimchuot.com/userfiles/file/64120640432.pdf
    • http://stolizstekla.ru/userfiles/file/58356157007.pdf
    • https://economiadecomunion.com/ckfinder/userfiles/files/31153038101.pdf
    • https://triosms.com/userfiles/file/84466887852.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d36259a24---58870851471.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/kutepirelipus.pdf
    • https://hgindustrial.eu/userfiles/files/83903824200.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/eb02c59a28376f0de42c8f96d0d28e61/45355955032.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba0.bin
4b0abdfae5679a0670989194794f3a022569f1fd7a2dbf141c92ecdd3e991eab
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 10964 bytes
font_01_sfnt_off000104d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 16792 bytes
font_02_sfnt_off00011cea.bin
35a1eabf983e0e2c9679820755101290a55441e6ce04b3b1af3c258a57e706bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEA 17280 bytes