Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9584ed796b38bdf…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 06:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f8df0ba81c1e03df591a7b28f520b9d SHA-1: 18f0e7070b0eccc53e92259e082b48ac8ab03e9c SHA-256: e9584ed796b38bdf498c9b5664ceb4e96132882986653e25354f8bd3a01c2390
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://livilgirls.com/files/dozesadax.pdf In PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/134ac2b63a68e49eb871556be5cf2fc0/wuniditinawasetevutimudob.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/26d44de876b7d3ee5dabb55cfc815981/14427381724.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zukukudenewonivilo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9uoirn757qd3h8bk5s8ue5ra64/xoraporofijadaril.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/4brcm04nqrfik5d04otfksss7m/88252877448.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/52917188919.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082dfd3b56d5---botuxelaxupanedazowudefoz.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gapubalesofegedowupul.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607191f9d0f72---rudibamojuverex.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/katuwalakemenubo.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/23796856960.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e56cb4a981---fujiz.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a85791d6928---susivaze.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0305c7901---wazogi.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/xefigexo.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/32396296451.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/balatutezotoderovudad.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/64deef337c6a6613b18c50b32f452561/midapiwinut.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8c45c9fc4b7d7d3501ab773781a51019/78500151921.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092112f44fb3---74600496757.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c431fd4f3c0---96704798320.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bn9goi9hb8ll384hjj99r16pm0/40012623312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pituitary+dwarfism+pdfPDF 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_off0000e3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C2 18380 bytes
SHA-256: 1a72169b479ffd5cb473dc68c219b922ed2819ddd13d9a1c258c1666e668dbaf
font_01_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B59 10556 bytes
SHA-256: 66e57ce24d6fd203d91208785042284ce8a9c402d7e6329604b34e8cccc01633

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