Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03b0e07546daf10…

MALICIOUS

PDF

93.5 KB Created: 2021-07-15 18:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0a55424788c9ff2443aa64cda2957c9c SHA-1: da29a5a2a4da33e0073bbfc26f0dc3a7707295c1 SHA-256: b03b0e07546daf106e67f117744811b24114847bf9e4ee7378be5c71f0fef7e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to other PDFs hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://autoteam.in/ckfinder/userfiles/files/pajufewotoxidu.pdf In PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://bak.vn/upload/files/3467269200.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/df0b89f77c6b0768c74536e30b7c480c/64871399123.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/nileneganowijumu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2363e59ca---vogewepegonedabetujixoka.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/35457918099.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/85528372485.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/faxoxetoxibifafubiw.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/559d855637ded8422b2d015cd217ed86/28879947895.pdfIn PDF document text
    • http://sun-tes.ru/files/file/bumamivigivanem.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/81969890210.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99214e4b3---84222807709.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b775ac4f8---sujefifexedanewetugerigaj.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/c6jlkj4i54cj4lndo331t8nsv7/vojabotoburavidadetad.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/41619046887.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/05245d0e2e7670d7ce6cfc33b39b469c/zadijutasoweguziwov.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4a6aa253c---lafokoluximag.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/13351322783.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac142168a83---75351460561.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/patatojivujujago.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4a98daa68---luzazugo.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5f02a600---sitasiwixevufes.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/95774478918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sql+queries+interview+questions+and+answersPDF 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_off00010922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 17696 bytes
SHA-256: 2a1e7c72b1b635848525d5398d8b0602980a5006be2a18f2e2c6ba9779642ba8
font_01_sfnt_off000137c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDE 10712 bytes
SHA-256: f62836e0285e9d371327faa10be4e7c13b14c2bca6b1c66344392b40b8d5b9e8

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