Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f7379708c4ae98…

MALICIOUS

PDF

92.4 KB Created: 2021-09-01 14:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00b6e07dfa9a176f4d533e52f347da6d SHA-1: ce8d7cdbf3cb626746484f665b918ec382ea8d4e SHA-256: 78f7379708c4ae987dc7cce91f7e8a5ff453ba83e47533a72af097c9e3c25588
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous disposable domains and compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://osoboebludo.com/ckfinder/userfiles/files/86974781032.pdf In PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/bc0a79d6009400a31acd966cabaf3c2f/83206529813.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/kenuwi.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/1dc43978fd4eab624b26432e8bae531c/rogarugilabuxolojipig.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/31819437540.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/vusijejoreraxado.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/fizemo.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/499062d530be1c7fb2d35573e0ecc3d0/13711693259.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4540ad1d---93386517049.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/13987870190.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/28435664798.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/52396314002.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/19960169657.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/fimugugexuxexizemat.pdfIn PDF document text
    • https://epiphanych.com/images/file/popevo.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/xexagadoked.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e3c714b2654d630dca0a54079d2a82b6/misuvimabepafoz.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/51617978005.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc52504f92---toloxozumujutemokegi.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/25035721021.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/biviroko.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/fivomiwebonitanujab.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/75787865177.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210808_D6EAFC475927D661.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/71681118684.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c354c7c9ba---54030935207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=forefront+meaning+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 21956 bytes
SHA-256: d313586da4286045995ac19c4957c398a645844ae95a12c4a68b2a47c131ab87
font_01_sfnt_off00011c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C56 16520 bytes
SHA-256: 98a776760939b8ef957bda1c19d54e6c8884798909655587be7c978eba215ef8
font_02_sfnt_off00013335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4C 10640 bytes
SHA-256: 119ab47994a18f0a54bf443582178d8f0cc218a40a6d59b7c15625f804c50bd2