Malicious PDF — malware analysis report

Static analysis result for SHA-256 596b99bd0ba2d21e…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 22:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bc53c212dc130ea1a0554bb42b6a82f8 SHA-1: 0c2c49c8a0334d6336db81bde8d37020d00f56ae SHA-256: 596b99bd0ba2d21e907511739838d5ea517277e660b7256057801715a7293978
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to various domains, many of which appear to be link farms hosted on potentially compromised or disposable infrastructure. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, aiming to trick the user into interacting with the document's content, likely by visiting the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cructi.ru/uplcv?utm_term=bootloop+recovery+mode PDF link annotation
    • https://anandamsanyal.com/userfiles/file/23592041901.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b836a4e73---40823183294.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9442ea44f956b7de7f1c27ff21ea0d80/71671100113.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/wazuzej.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/72110563370.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f34b030da---31910995961.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/10678332219.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/39251324761.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/diveduvanesokedite.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/gufabuz.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/xebonuwisedutib.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/82094506146.pdfIn PDF document text
    • http://hzqzg.com/d/files/8235158708.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/volezimujupoworabowur.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/dibeburadibu.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/34138861904.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/66092242613.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/23878480185.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/29614293832.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210906031919.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/junudejarozitimawud.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/68196305569.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143f132a6f9f---35174784217.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/1c83cc1b65aac3697a575dd182b7e014/41631008037.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/rugumigodufif.pdfIn PDF document text
    • 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_off0000b3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C7 10384 bytes
SHA-256: 833b97a822910f60befb4c8e3f1aa9dc63943b791aa4e5ebf3fd2c119055c9e4
font_01_sfnt_off0000cb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 15200 bytes
SHA-256: c211e3f4f08b36133a00f215313b090b7ad93efe33499bb96b3f9980a792eceb

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