Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e5ba863eeab2f4…

MALICIOUS

PDF

90.2 KB Created: 2021-09-04 19:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4d42b36c42b39c6920bec0010798c4c SHA-1: b2ecf058448afefc5fbe11b4df8d246e06d4a0d6 SHA-256: d5e5ba863eeab2f443ecf44241e037e48e64d8fda46600ab279edc26ad694244
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=raspberry+pi+2+manual+pdf PDF link annotation
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/f2e601595b8934333889dacb4d322e42/xogalig.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/7510508205.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/80ad3a1ac64df4a1af590a88d6cfbbd1/jemasudasotiruwa.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/51725965658.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d75df05f4---63061021589.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/bogizemimire.pdfIn PDF document text
    • http://lucann.com/Upload/file/wumijimevizikobotal.pdfIn PDF document text
    • http://texmet.pl/userimages/file/topatokixod.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3626mb8coj1hpu5qum44b8mjv1/79201021259.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/368a4fb65242bc8eb785037257ad39ad/59144866522.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/37134496061.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/zutasezibobepukinobi.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/rofitaruxemigupurexega.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/60135003846.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/qdhbcuiua0kubn1de8m9f33olu/30030072325.pdfIn PDF document text
    • http://atraba-holding.com/userfiles/file/94877629417.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/61d7e1f851f9a125349b24b0fba20244/41152412357.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/simoxiju.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/dolonerutujivefusedadela.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/tibekoxa.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/b0qa8tn6hqbmdid80eq9sg8949/11774461615.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/48dcb098ad9f8a3db4bf89edb9cf6151/72782760223.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/91632114309.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/63403091884.pdfIn PDF document text
    • 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_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 10960 bytes
SHA-256: 8aa2a4c2bff6a247bd26db63c492f557b2041d4a5e9fd539972ae661988ef3ae
font_01_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 22200 bytes
SHA-256: 321f0ce5558d323bfb49162fb150d0e7c6737cd06cc9cc8089c1838488bd0704
font_02_sfnt_off000142e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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