Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1b574c257ad522…

MALICIOUS

PDF

91.8 KB Created: 2021-06-28 14:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d66ece399f50f9d23629b48c917a21b3 SHA-1: 8e5f5bd2da752e1892cc630a65b23e24d5368a27 SHA-256: 9b1b574c257ad52237857408f02659d79c0976c49bdd4c4f7ba94f3fff857c5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage and disposable hosting. The primary purpose appears to be directing users to potentially malicious content hosted on these sites, likely as part of a phishing or malware distribution scheme. No scripts were extracted, but the embedded URLs are the main indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7ad164a21b0755b1238f04c5c1514943/84068859102.pdf
    • http://ristoranteibucanieri.it/userfiles/files/63668419117.pdf
    • https://mamap.in/ci/userfiles/files/93380081194.pdf
    • http://vyveva.eu/UserFiles/File/guxubuzizokixetusisute.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/02ba6db8e12605a7c812d3f06ced1cf1/66001197411.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16233946133107.pdf
    • http://canphantich.net/Images_upload/files/nitorowenugonikabazofa.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed28031346---69886523902.pdf
    • http://aylincinarli.com/fckfiles/file/baluvafuxelosem.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b6b88b1c9---geboli.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e95c1e6e8f22b6a968ab4c85d7d659e2/98967946503.pdf
    • http://www.pattyn360.com/upload/forum/files/madutidovabelarotiluvowa.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e0924cd41b9393a68bead19d1a3ed711/42391893434.pdf
    • http://movietek.vn/hinh-anh/files/nisinotaratowagidefutipa.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e285bf200---79659487270.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f3b76b2ea543a2f0295ca68036f2d96d/30691159820.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805ea3b3a8e---livemumaxug.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7b416764e6959f4c37d169bf4437262e/kibivabojadakaxaluwumuk.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aca8ed59a58---13408590907.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/fd6f7fi1rbs58efjvcu7etjchl/2070955419.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4060fb45c7b68708d6603848109dceb0/35015738410.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/bc5dc999ca4e1ab3a038ec523edbb790/velofogirimifinavara.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4834a298adc15924c47a1de9fd8af3db/87615510971.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=solving+systems+of+equations+by+elimination+and+substitution+worksheet
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c6.bin
f774f97cb2e199d8f7f74256dfe4198d9f20c6b6c818e2e6838abdf6e10c2731
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 17444 bytes
font_01_sfnt_off000120cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120CD 16792 bytes
font_02_sfnt_off000138e4.bin
5b8898bb3e682b10961c5f03e5a5e2b254a85212fe8b63ea2a079da5df1dfbd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x138E4 11620 bytes
font_03_sfnt_off000153d7.bin
bd73b5cda4c46ceaa1ce518fe59727012611f6b756c58b2724d6cb4171b51093
pdf-font-stream PDF embedded font (sfnt) at offset 0x153D7 3092 bytes