Malicious PDF — malware analysis report

Static analysis result for SHA-256 658fcc42f5de7d61…

MALICIOUS

PDF

66.5 KB Created: 2021-06-08 06:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: d12e66c5d029a38d9cd551da67242d92 SHA-1: f46e8d83ed6dccbec2a05627a59f0ec7e98b725a SHA-256: 658fcc42f5de7d61825cc672549f41a2d1184239a6372e44aba4eaadfdbe3b04
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. The document contains numerous links, many pointing to compromised WordPress sites, which likely serve as a link farm to obscure the ultimate malicious destination. The primary lure appears to be offering a free download of a "Mankiw macroeconomics 9th edition solutions manual pdf free download", which is a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8600

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=mankiw+macroeconomics+9th+edition+solutions+manual+pdf+free+download PDF link annotation
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/29001a074912c3e12f56a4aab245291a/70256945187.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a487d4c67be---zanivogekipiduzobok.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ac04c7cd8df9491ef354e9c56b9d1eb4/23048655179.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a97951d2ec---xiturak.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d04aad7c165422cd3c845aea1667fc09/4930618448.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085e96662d14---61948819292.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160718b780ac90---mitodekaximim.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/lopelixikimosotadixef.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827bb6eaafc---zovukofimuvogekegodezogo.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/a02211d0ad930964c5affe825f1354e0/loxumakadotupuvabekokojiw.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073b85dacc76---33947452151.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada062c46f---budigabel.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/vazuz.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ad6ace1a---18209845400.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608064d700c95---25025897912.pdfIn PDF document text
    • http://qca.ch/userfiles/file/jimibexe.pdfIn PDF document text
    • http://tcihk.com/userfiles/57914982849.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba833148cf---wokudafel.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 5596 bytes
SHA-256: 8ba1e79718be69cb5d0c7bac6f2b3a3a92f9d5d38db2cd6cb958402345644b32

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