Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f30957e3bbe0c5…

MALICIOUS

PDF

83.4 KB Created: 2021-07-29 21:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfee3a94675c178dec121eb7869efb52 SHA-1: a4d86434feba240c1dcd19bad3685f04b002777b SHA-256: 15f30957e3bbe0c53eb453935a1905aa7cce0c7c6b7c5cad349bfd2c150af2d2
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs suggest an attempt to lead users to phishing or malware distribution sites.

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://infrive.ru/uplcv?utm_term=what+is+soda+lime+glass+used+for PDF link annotation
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff3eee2428---bebewurutezigomegoji.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607126283b549---12194095032.pdfIn PDF document text
    • https://europartner2.pl/uploads/26933225212.pdfIn PDF document text
    • http://gabortech.com/admin/file/kenuvetures.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/92970972516.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/suveriserarar.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/jesijaxapazakomaxedoz.pdfIn PDF document text
    • http://toyotarenta.net/FileData/ckfinder/files/20210714_97230A4B2EF5ECFF.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/latuladunabuwexama.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/0ca56794245991a69f0ff689c9a035bb/12697056267.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54651385109.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6bfmqi2ars8scuakcnqdqd885f/11921717761.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ad56cfaf874---niwovasigevotujoxifelixu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0e08b00a---84561304620.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/kenaborobumow.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/69852d8a9eb3bf2c171f570494e37c86/99279606462.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/varokawuwuzidovuwawexo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe69a1c545---kaguwod.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9a93fd29---derevixazejigova.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/renaluxopumexoji.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/48973519028.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/beseg.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/45692398733.pdfIn PDF document text
    • http://domplus.su/userfiles/files/12380701879.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/45139798139.pdfIn PDF document text
    • 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_off0000e127.bin
21feefe3c621c54d7372aaba817e312a68893d6ba55e2a0bf6eaa0163438e9de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 17324 bytes
font_01_sfnt_off00010e13.bin
15942aaead9d13e3d552a048d9e4bc60854765eedab76fc5755508ea0e6a793f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 10788 bytes
font_02_sfnt_off000126b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126B8 16792 bytes

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