Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea6fac584b0f432…

MALICIOUS

PDF

83.1 KB Created: 2021-06-26 13:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3aacb91c72f42d0e509869b73e95939f SHA-1: eed311c43372a310bbbed5c1e4ca4fa4c37fac50 SHA-256: 0ea6fac584b0f4321274603718858716e5990e0d696302d047ec2c04eac131b8
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, indicating a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://amblamy.ee/upload/file/gugegifaxirepit.pdf In PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/13206479594.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e28abde571cbeea45c7a97143ae07a5d/26772654227.pdfIn PDF document text
    • https://mmszke.hu/files/file/6071012226.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/2139381701609571af34f02.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/23320433654.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/meron.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/73566605994.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/47980254783.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ab12e320f---23803515566.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe0d0719d9---numefejukipiwape.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/i2e7hu2rk75un2e3r51006gtom/rapapexavisokisegow.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b208421b0---pavusepigafibizinomod.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/d9pq8q3reiqc50k4di12sm27e7/94158349854.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/wujevitubatu.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/wubovesetaxilubetugupojaf.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fd04982994b8f42c6f332037cdf6a0dc/fixujowesezuworasu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4f2014e6f---67122201989.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160af9beef33c0---35300793578.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6a6a5br2auk9ulfi7s0esp7qe0/rozegatipijeri.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/a7831e7d1229455178b22da7d30e9c9a/safigotobo.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/vezilulirezoloxojojotiji.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42c7ec64a---12316044718.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/55b218d619a21c56d8cc18fe0c1f48cd/butilof.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/gegujovakotezenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=class+7+science+electric+current+and+its+effect+question+answerPDF 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_off0000e132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE132 10880 bytes
SHA-256: 384c795ff0f1fb7bdbec9d061069a9a7a40e86aeca23f818d308d39b01e2b487
font_01_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001127e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 16168 bytes
SHA-256: a41d9b3096e855d4716816baeb755c755ae6a3093f05271d481b0d500222b89c