Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fbd7abf87bc862…

MALICIOUS

PDF

88.9 KB Created: 2021-07-21 03:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 744ba0f557d5cf86a96665a0d806323f SHA-1: f7b4197198d0af4df4f266a2e74192f72b47c98e SHA-256: 79fbd7abf87bc862d3f1ecc28272fc0e8b58d347822b54f61d54101b657fcfdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised websites, many of which host further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content, potentially exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://asset-books.com/userfiles/file/monekaxit.pdf In PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/96c9f3e96172a32e68a2fd293a1f6036/zujizutatujujupole.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/jamukuzujegopuvet.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/3020174245.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5517c019972523e420ddd6c5717a0073/sumekopipafoxifozisu.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/zojegesowexono.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/lilupamobunene.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/q433v0vhbu60f63r5knspurbl9/magepunimobawi.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/zirijar.pdfIn PDF document text
    • https://artenika.pl/fck/file/selazabezifedul.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b419e6b7366dcd39ac6df46dd76ce94c/wiguxokejuzerajugemaji.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/xubive.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/64675621060.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jaguvusije.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/3931e936ceffda2d3313513821a8f2e4/67324069878.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/60njhqgmajo35qq1s80ck0up2g/tituvedoradawewedulew.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738cce89e23---zunumewexuzuz.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/ledope.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/81723607908.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210620192724.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xukosis.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4von5ljiiigqa2c8k1v8k550r0/23622236132.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/bazowonujekize.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070463ebe8ff---masuzazowexojoboxudes.pdfIn PDF document text
    • https://unitjaya.com/contents//files/5998640508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=catskill+mountains+factsPDF 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_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 17860 bytes
SHA-256: f3037fc74394f6b173bad9d44fbd45cbab77f8d7d355a6d29d5e7d66a2d2cf22
font_02_sfnt_off00013eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB1 10488 bytes
SHA-256: c19024e4168351f4fb86bc0ab79c5037b7953b8ff21334dd41b8a3c12239c9c9