Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac8239df1c4bd95…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 14:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b704b502471d6eebca6012db1d42b588 SHA-1: ad2b553e5b20dd2561cb5cbe450722db746daf2a SHA-256: eac8239df1c4bd958bf066bd3ec619bbd2e0af02c333f54be011bef91fd307cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d70d3da9c2f---56215171144.pdf In PDF document text
    • https://fallsplat.se/file/6030457458.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/2f9060cbf4acb82fc08e20e6935229da/88165567504.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/68662508217.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/1460964070.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-6/20210906133237169697.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e821ea0cb---89305633415.pdfIn PDF document text
    • http://babamoleskine.com/files/file/bajexozorupebijuperat.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210907170910.pdfIn PDF document text
    • https://badoza.net/userfiles/file/75780884023.pdfIn PDF document text
    • http://rideco.hu/upload/file/89993462559.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210616_B58D2AD905775575.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/biwemagataka.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079584d4f1ec---givekufep.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/86540400122.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210717_5B48B13CE09611F5.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/qgctdjp77rumchh657t17ve7fj/togonix.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884a14b95c4---guripelixirid.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/72185423cc6fcd9fff37c869158ae9f0/4339923430.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a1a7305235a2c8f6030d68e20d1a4823/77543490750.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b3616737d2791e4ea75aa7b422525301/wugamagapawugunawir.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/88755902964.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/dukulosubir.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/dedusesugaziwiwewopipego.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120ae64295ed---35425817813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=archicad+18+rendering+tutorial+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_off0000cdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 17704 bytes
SHA-256: 100e6cbd4ba9c1c17fed5aa530086469d6d06a590b81a59307ebdddd960a2515
font_02_sfnt_off0001136f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 11072 bytes
SHA-256: 90acaecc226bfb68a37ebc288f91bf27285a3575954dc1aad29d5e518909894a