Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb49c78899ee0d3…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 15:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a16a6399bfd4235a86ea623247def515 SHA-1: 37246acaf50b15c8ad1ef7d66d9f9369cfc45f11 SHA-256: ecb49c78899ee0d34018b9d12bce75036ef3b67ce0cacf2a7d51e30826d47a85
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and link farm indicate an attempt to redirect users to malicious content, likely exploiting a vulnerability or serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://h1t-urlaurora1-turbo.com/contents/files/pimanixenolonowujapogar.pdf In PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e347526b83b---44301034542.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/bavibegirogodido.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cbe6cf86f---dubawu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1f26e8b70---35620868171.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/52137268042.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160727b1bf3f4e---tofodopumuniwegaberuzi.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/fojurixozaminal.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/3bc6c0f81354f9bb961ab5b1580c5d87/50048895141.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5c002de4---63559039352.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3b017313---69097220053.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161064b226b5c5---pimovobitazunite.pdfIn PDF document text
    • http://jinohair.com/upload/files/renamebal.pdfIn PDF document text
    • https://0900107678.com/upload/file/bufesubunejirepakixuv.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/kezaxewapelibiti.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1319f7b475---28673660280.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/34a690a821e032a946afe156683b76fa/20913768034.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078e6d0c93da---53630959180.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/42m2i54mf8s07b9een3br3k8o7/73252215998.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/gegisituvirotijabubij.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/ridewiverukelus.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/bexisowogepaguzoxe.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a70548db1a---powenomemadewozemajot.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/69838231330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=convert+scanned+pdf+to+text+macPDF 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_off0000d61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 17144 bytes
SHA-256: 223533b845089036b824ff2e4cb65bbc78c25823c4daf36d55d21e125b7f3a54
font_01_sfnt_off00010264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10264 10840 bytes
SHA-256: f4b65b4214cbef42b4f427643a5aa28f7cd496d441c49a8c6f19269e48f86e09
font_02_sfnt_off00011b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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