Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6eb11824de778d2…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 04:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93344983e0f3e4b7f2f042ba5d0f142c SHA-1: 348a17177a572786410440a2b66a1f65a8b92a7b SHA-256: e6eb11824de778d20aa0ca28fffa186307b6894245b53ff58060686d92933041
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis confirm the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://geometramaurotozzi.it/userfiles/files/11508442571.pdf In PDF document text
    • http://vendsol.com/userfiles/file/60560935158.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210731115933055644s29t6y.pdfIn PDF document text
    • https://khanikango.in/file/95155736366.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38efbc419---dalagobuwazulugidu.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/mizelaxadep.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e79a39e6d---senuwutatoge.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/14894654246.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/4onopjt2arhqc3oikmqt4g7ubc/nezuf.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d47e2cee4a9---57950484324.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780288af1bb---33896378273.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/19212498234.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/12978470304.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/nopifagigizez.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c82a90fcd---nebubulodur.pdfIn PDF document text
    • http://limoride.net/gallery/file/zibanapadoruzulovoku.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/f36f49267186a0d580cc9b5983ac697b/dufuga.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/mopoluxironosasikine.pdfIn PDF document text
    • https://kaparatt.com/images/File/viwiginupobusunikelu.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/kedow.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3cfe40da275609234b0808a331abf17e/sedoroxadawurimijewe.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/45935204278.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b35bcfc4d---gojevuzasosogilesojol.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/19263116119.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160917c73c23c5---37912085231.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/011f65eaa7c5c92684dc545f9d8726a2/62703679251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=chemical+reactions+and+equations+class+10+mcq+pdfPDF 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_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 18288 bytes
SHA-256: 0c5fb927ed6c9fd309210faf947929ae794cdb3cd6f06fc092c0c460d29184f9
font_01_sfnt_off00011996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AD 11336 bytes
SHA-256: d82eefc806619dc06b6742c99314fe3deb6608990ae586341fa7cc5176586dd7

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