Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff843ee0b91e33f…

MALICIOUS

PDF

85.3 KB Created: 2021-07-03 07:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b80f86099d25fea6bf8884423de49967 SHA-1: 9b077d2cdc84ec57e357b3ce64ba3ece88637594 SHA-256: 1ff843ee0b91e33fb9f2d19fb045d07a76e3d10f957127b70d80e39e35d80116
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=concept+4000+installation+manual
    • https://klcmekatronik.com/ckfinder/userfiles/files/pudexogoliwug.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f77d2ec82e---43432782612.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b624e07c273---kivasoponokamapikaxoriw.pdf
    • http://headrepublic.pl/images/files/kutet.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/9d020lnh0475d39lta9elun45f/34923708609.pdf
    • https://people11people.gr/uploads/File/73148317942.pdf
    • https://isosklo.cz./uploads/60709915201.pdf
    • https://genia-groupe.fr/images/files/loxopukikuzivaduti.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a72cb284261---94552924977.pdf
    • https://allcreaturesinc.com/files/files/kopubuf.pdf
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25700469342.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db16694e42a---tikupexebiminafeniped.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/l16ibu4oeskot8pjvp9t6991t4/55613833110.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81e445c0f---gowogarikovajebenabufovar.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8c3a687a---11804807793.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16086169c7f469---51165888252.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1ed1c34f25519919703793e83ee56188/zarumimewape.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb804d8dfd0---79406334824.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608064d700c95---25025897912.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075549af0339---49013459107.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/92df9e0affdec361f3bd9aca4be040b1/samusovunutobeni.pdf
    • http://alliance-ic.ru/uploads/file/vexizaxotezajibat.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c12099a9d---verabi.pdf
    • http://angarakshaksecurity.com/userfiles/file/69631499998.pdf
    • http://diysmart.net/userfiles/file/sarunavet.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_off0000e9ba.bin
0575f52760088f9a1e0f684ad3e326137495e8d4d3c7abee0a084ad9e38ec66a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 10764 bytes
font_01_sfnt_off00010290.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 16792 bytes
font_02_sfnt_off00011aa2.bin
a9e4ffdbe5b829c355526f92121c7b6f1b4d7efc84b4652a6580f5f02093aaca
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA2 17112 bytes