Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94b23a59e33ed35…

MALICIOUS

PDF

92.8 KB Created: 2021-07-31 20:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 452942fe60b7471ef9cfe02249e75ddf SHA-1: d44b232b560dedce3301d2783cdd21eac680e2e0 SHA-256: c94b23a59e33ed351b47efc447d797cfee975c1c73dad3e52f1d45737853144f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous URLs, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://meteosputnik.ru/userfiles/file/zarepikirosekupatebamigod.pdf In PDF document text
    • https://gemwares.com/userfiles/file/rakefuvomofomolexorugolo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/92f7ecf663c6051920c8122e5d8723b6/30731050549.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/botiwamupogotelere.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/metowazosu.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/43112803832.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/sfu63s27o04dr6tgdlf5fu8iqo/donevixetusura.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfad50bcfb8---sofubekedupomaluvem.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7c0b11d6---44352360396.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4b0737862---kujapimebitozuwoko.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/94c8f4df8af469317179b015357a75c9/jixevumisevamenarekiku.pdfIn PDF document text
    • http://berbun.com/user_img/file/jonapaxozujifanunakoxe.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7352786731---zumirisedadis.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792b62f339e---guzulezu.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/sotoxoturiseraxituzuz.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607279604b206---72595450518.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d1213d1cb88d7c1ed4dc843bbc012adc/57959579215.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bf28d3a7fd664dfb74530f3c0e56bcd6/pekadimafitubulit.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076c49c593c8---rowul.pdfIn PDF document text
    • http://metapolar.hu/tmp/93585397555.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/14576023366.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/58062dce7d4e63b45ec08b2a5352caff/kuxirimejetop.pdfIn PDF document text
    • https://coevent.ru/upload/files/91922591812.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5c6730fa---tapurijewoxujutigev.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/77190944596.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/70553920088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=descargar+neo+geo+completo+por+utorrentPDF 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_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 19400 bytes
SHA-256: e9b3ac108171245b251dd6bc9711e4ba8edb1d11a7666e940332111a13df4ab5
font_01_sfnt_off00013213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13213 10728 bytes
SHA-256: 681d0ca4518ef6f7880535099769ef73907ce63fc945528cfc4a67092fb0ce8a
font_02_sfnt_off00014acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1