Malicious PDF — malware analysis report

Static analysis result for SHA-256 c753049703b0c2a9…

MALICIOUS

PDF

96.6 KB Created: 2021-06-26 17:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2566b2f717246da06afd54284605e80d SHA-1: eb0820ef7eedc641d4babd7efd3dd0ca5c4dad3b SHA-256: c753049703b0c2a98797befdcf83284956dddb6e633f3fa8ee28d90bb1256390
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to domains that are either compromised or use disposable hosting. The primary purpose appears to be directing users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://akkoryazilim.com/userfiles/file/40969588679.pdf In PDF document text
    • https://immobilgold.com/file/16297712014.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/xirifuw.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/82252109843.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf379add403---lazibejuvirufekedawow.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/81514460564.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/93789048058.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ij42kqd289j2oldr09lm3tb040/80261777818.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/jader.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f12edc44bd712f24df38185b8d364485/90306492447.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/20754039456.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/61824692463.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/769d9e1bf9f654df427dc58a57594cf8/refirafojagabarojex.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba764b051---ritenanedina.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ibadvon7c8ldscc7camipv6s96/volajabiguvepivaxer.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/vuseronidogaro.pdfIn PDF document text
    • http://intergeored.com/upload/File/xedenaparosalejawuxifik.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/e773b3951fa6cdce43876b05661a7f76/bonogamolamikuzewawa.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af1e212e376---55266775050.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/tumarusisudule.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/711c2e9d915b2ad87d896a8432782345/lurubuwopobubutizud.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160799f0d3da6e---9684462456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=funny+self+deprecating+quotesPDF 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_off0001132a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 18448 bytes
SHA-256: 2d0239b5fa70b9e00184f103868ce888ec6a260f1deb591cf56c6e80194b9eaa
font_02_sfnt_off00015bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BCD 11132 bytes
SHA-256: 6e7b58f4f292057101ba8fc0f0a265ad6adf8926ae4e63eefd30fa03256119b2

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