Malicious PDF — malware analysis report

Static analysis result for SHA-256 a764578b39ab82d9…

MALICIOUS

PDF

94.3 KB Created: 2021-07-30 02:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98678c5fe0283a56ce48e54a9a8e6414 SHA-1: bcf0619beb918c162f7eb7f0bd806582e5ff145d SHA-256: a764578b39ab82d94545c0a080cda331e17ae717ce0578b81ca752ed853577f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and other domains hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning. No scripts were extracted, and the document body was unreadable binary data, suggesting the maliciousness is primarily in the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://hobbes-group.com/upload/files/18609434067.pdf In PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/19510551518.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/werabamo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609232df410f1---roxozorekedikemipoturipax.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/777cc38a34c348e12e8d499198955238/71197888178.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d2cce8b30---6174729919.pdfIn PDF document text
    • https://cape-electronics.com/media/file/86211587800.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/768c26d6b7f4dedd58b98dde3f1914e5/99923716593.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/477e3cd438e640069de726ca220b681c/zovuzajikuwoguzupizi.pdfIn PDF document text
    • http://www.centralperdana.com/file/21832063245.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/bunalulugutunop.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/25287675737.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/15156914553.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/ruxiregop.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/vogusudenage.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160863987b86f9---zawafoxagalawitije.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160785cacc25c0---81731630611.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab390bc93a---52702909953.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdaea8e592---75310996567.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/75698702325.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/153de3bf5b6763fe174a064586d1c8ae/dajizogafaje.pdfIn PDF document text
    • https://bursac.net/userfiles/file/kanememadikebirutu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9tn2mng1pm7fhjqsrns8slmf7c/wixapibewi.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a77ede129---91284064762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=audi+q7+2015+service+manualPDF 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_off00010b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B48 17612 bytes
SHA-256: 8ed448725eebbbabb67377158264ce83e9b63eb3dfd1423399429f66e5b81ccd
font_01_sfnt_off00013918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13918 11084 bytes
SHA-256: 98aa0aca3eaef81bb23633e4796ccffb248205b85d4d923c6339e8566d9e9525
font_02_sfnt_off000152ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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