Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f3e3068fe0ef92…

MALICIOUS

PDF

88.7 KB Created: 2021-06-26 10:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ec7696f3587cec436db09c9732bb5b3 SHA-1: 015d1ccdd1a1d57662cb529c6294d7557204de59 SHA-256: a3f3e3068fe0ef925eb4ca21e0d2d42a33ebc7bf09da6a656f02fac17458f199
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, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://allytemp.ru/uplcv?utm_term=105+universal+laws
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/7bb1f951c23b2b9b3658a38e00dcc187/takoberulorebobiserebe.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/3894240c7856130fb5a94a0c834bb651/kafixaxuwara.pdf
    • http://moreit.ch/productinfo/file/situwarejazojuz.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc48ce1acf5---20433776170.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32f3bc137---80996486759.pdf
    • https://twr1115.net/files/fckeditor/file/87628206400.pdf
    • http://hurtmar.pl/Upload/file/23473576661.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24186338134.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/81f3a72a7f636c772ee68cde64061ff2/58036862585.pdf
    • https://fnb-concepts.com/images/uploads/files/79755176449.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/obu1i1gm4vi78rpkimchet424q/japovewar.pdf
    • http://heninrealty.com/userfiles/files/biniregodegewupafo.pdf
    • http://interel-rus.ru/test/sites/default/files/file/54777250034.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f0167250a---jamaw.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/7ofvbpuq1j2sstmahvr73051jr/88308174027.pdf
    • https://guapa2.com/admin/fck/file/55840794799.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52fca68f9079d8eb9093a9f67bcfb863/35587498425.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607487483a930---20287464207.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/aaeb70699d0da18b9efde5f076ef5243/lusupofuzezoberafime.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc1a798a2f---magunuzuvegisu.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb0cc7270a---62376253117.pdf
    • http://romanakladatelstvi.cz/userfiles/file/19720623848.pdf
    • http://ausafe.net/images/art/files/dujimudabosuwezefar.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c871b3f3ee5---21468496871.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2635a24e47---porowinudidukagazaki.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e49636086facd59b905e803da5089001/pezixonapole.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_off0000facf.bin
92818c4f8fc0eacadafc762aefbb55bafd31008d2b98ba5f015d7d126f0eb93f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 16616 bytes
font_01_sfnt_off000125f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125F5 16792 bytes
font_02_sfnt_off00013e0c.bin
2d1489c348d4f66da904c74ff7c94f29628dd0a67558ea1d591fd1abdcb539c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0C 10344 bytes