Malicious PDF — malware analysis report

Static analysis result for SHA-256 eadbd37a972cfa1f…

MALICIOUS

PDF

99.9 KB Created: 2021-08-14 13:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1045c4be0afdd8b50914d7485ec41d43 SHA-1: a13b8bc1eb49856e9f477e5825b7308bfc3f0b54 SHA-256: eadbd37a972cfa1fed12d3929fa86d87795af81b1fd6026b772ed4e1edc01d64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting it's part of a link farm designed to manipulate search results or redirect users to malicious sites. The presence of external URIs and the overall structure indicate an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://vorne-sitzen.eu/pcms/content/file/92538293406.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608685c4a9191---21419569455.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9666655aec5331d61e7a1c3268fd3fa8/fimamupoletoxov.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/kizivezifaz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c15df3504---vegeputun.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/32261128324.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/d9jmkvh9ucuohlraojumiucmiv/59910568372.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cf665fc0e---nisisatesi.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/junefak.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d3eb5e8fcbc0e76eeb59d110464a9a0c/29502176387.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/3626961902.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/61907412285.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd14e36b39---dukilukume.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5f24215bfed4be3c76e4f2841b59c305/84936872105.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df4b4ffed146e50ff6d3302e44c24319/vedusiwoviparariwedolo.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d049b01610---lovimuxagubug.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/25182018477.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609099dbdb7ee---tuxatofikozom.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/38591918289.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/feruvejogesarom.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/51142199948.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca74ed0914---wamufifopezulavil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+calculate+bending+moment+of+simply+supported+beamPDF 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_off00011c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7C 19408 bytes
SHA-256: 6897cc81ecf42c9dd4d418cc4be7c13e0cd713e7fb36e8e006644c80974ec0a2
font_01_sfnt_off00014f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16717 11396 bytes
SHA-256: 1ede4905846ff5c5e27ac8c92407e9bc13bdf7e0560699fa48128e3eb8802ac4

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