Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b998801971a90f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-10 01:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9dba4daa254b20c07a142ae3a54f031c SHA-1: e017c75f9e35829674d885cfe0828357d61993a6 SHA-256: 23b998801971a90fbddec74a0b7ef6257d42188ef96bcbe0a2b10c7118c7d132
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context. While no scripts were explicitly extracted, the nature of the links and the ML classification strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=battle+chess+ios PDF link annotation
    • http://aaz.sk/editor_uploads/files/vewopixag.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/43816316762.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/87720318695.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/51023039810.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/bosarov.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/fufudubevolusupamip.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/jinixitokeso.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/23115907880.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210901230651.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/xekesamonesegawomexarog.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161364f6aa3821---83028930597.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/95716300892.pdfIn PDF document text
    • http://maksimetall.ru/files/kogawupudolomiwode.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/deruwowor.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/nepoli.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131be3fc477e---kerojakesalogigaror.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/xonawubezu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/14g395cu2bb9avmjl46d5ebkt6/fituketelulazenubanaku.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/wivoj.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137edc90445f---38353642308.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a71b2ec0dde29743d9cec45d387aac09/89205993080.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/jeturom.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/fikilag.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/vezinadewurozofebaj.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/pojilokeworirutu.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_off0000be9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9E 16284 bytes
SHA-256: 2b79a27659c53a73ef7a2ebe90df187f413a16688ec5f405db762157771e4956
font_01_sfnt_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 10176 bytes
SHA-256: 5dfbdb53985c5df08c3cff48e89702011c61c3ade7e38c8ae385645c262d3ea1

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