Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c6a57cfb527835…

MALICIOUS

PDF

98.1 KB Created: 2021-07-10 01:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: efc9eb5fe1a3e68f19f15627361e476b SHA-1: 1302294b15fd8d549fdcfd6dddafc780971bd9f2 SHA-256: 07c6a57cfb527835d9611d93316027873a84d3ec103838740e8b82a7cce6dcc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that functions as a link farm, directing users to various compromised websites. These sites, in turn, host other PDF files, suggesting a multi-stage download or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/semefugikizoradawu.pdf In PDF document text
    • http://simonhoirup.dk/userfiles/file/18700368786.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/bosukidilewijekorigatulaf.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/zexuzugozaji.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090635827c8d---vulisidusajuboluvonuka.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16084e67d1a32a---lajeruxurom.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/347999dd28a019b61b0bea29f9c7f6fd/14960215094.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d2bac54ab93cdc293ced16ac10631a2d/68308560119.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0f7485e2a250a4a1e4a2132fb29cc9e1/82357932155.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721faae5032---86468147065.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e97c8a948---nazaduwujaboromev.pdfIn PDF document text
    • http://thejosephinebryantfamily.com/clients/48776/File/99253197112.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d04176121---xegagovojat.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/m1utca677ins8u2htdu3j0ocmr22a7e4/denifixukosokuz.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/1689919854.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pexekazimosixajemolerud.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607921514f663---ledufoxodexawuruxaga.pdfIn PDF document text
    • http://farmina.ru/uploads/files/nubosezuwewapa.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/wubufazidafufunipilu.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/h5nt5uhhqfsf2tq00umc4dbv0m/ronalimivopunilevap.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/fufalabebagumofuvevidu.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81281266500.pdfIn PDF document text
    • http://prota.ru/upload/files/17502223540.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///83058056922.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f84e6486b---48816127664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ragging+meaning+in+tamilPDF 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_off00011f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9F 17216 bytes
SHA-256: 8da0235ad04cd369327340cf7aeb0894ceaec0b563a74d6bac37e1337c12a9eb
font_01_sfnt_off00014ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F7 10108 bytes
SHA-256: b2e0f611b5842b59aad5f2ede35781e4a71d4183f24aba665253d81a383cfa7e