Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b0dbf25622271f…

MALICIOUS

PDF

108.7 KB Created: 2021-06-30 17:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6abcb01543c3e733d35f9a95ca473809 SHA-1: 4a23b724c1a7f326b0b83d943f3d7ba05c5e6708 SHA-256: 08b0dbf25622271f9e7fa28931c78a104a076fa030b38f6b3ede4ce64f25bbff
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The PDF document body is heavily obfuscated and unreadable, suggesting it is not intended for user consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d62915a6deb031a3d4db525deb7ceb50/vumoxido.pdf In PDF document text
    • http://assytekservizi.com/userfiles/files/20480838234.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddbf43c8d5---vofiriviziriwez.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/dozegotejefupux.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/da0010fbcdefb0dd7204a2be9f8f450a/doroku.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/95919701029.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b48020f208---sejilumugog.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/838a68810e7e931899e342dda76250cf/fujibevafodogufojiralabe.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/1295869438.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/73332207920.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/q3sjl477rr8ssp5ham4jnnfhm7/9935407232.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0cec1c288675cc0af5cc3834cbba7b6e/47512922441.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f97b219155---21067788876.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf9db04f2---sixovewigi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160816db964dad---91917612719.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb43eaabd---55475894871.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca68ef0c9---witogof.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/2137177759.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/mugotonaturem.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/e09d3nsoq4q07flgpvuer6uamt/66467351100.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/d31880a5b6cbe22a021b4eaa3ea74a52/37572154833.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/manuxezinotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=bhutan+tourism+from+indiaPDF 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_off000145ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC0 18288 bytes
SHA-256: f08ee56af293ccbc510341d6f1060613f6a41a1b2168dadbf28a61bb93c1ef03
font_02_sfnt_off00018dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DD5 10592 bytes
SHA-256: 2dd98c9d5472156cbf9851c59c42b1e5dbe3dfecca03fd44d9fef2332ade3819

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