Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5bb2380806cac3…

MALICIOUS

PDF

83.5 KB Created: 2021-08-07 09:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 078f7d7093661dca0a35f2ec30578393 SHA-1: 7298eaa804b2c0308659e5bdbaa4d0e8419eb3bc SHA-256: fa5bb2380806cac37aa236c9a2777fdf0790ec8d0553ba7a6e3cad73da9d3840
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://glotecgh.com/upload/editor/file/13287737961.pdf In PDF document text
    • http://intelekt.biz/uploads/pages/files/29306072576.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/305d76e3968e0e6f47261828178051ea/11736149861.pdfIn PDF document text
    • http://ilpeace.org/assets/ckfinder/core/connector/php/uploads/files/56869701034.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/bofinazu.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4m9dauagruidh3df1eeimteu77/49520716300.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/6396985026.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d36cbdf861---doriliku.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/52594762609.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/92244565993.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/gidafitifirogasimebuta.pdfIn PDF document text
    • http://blueyee.com/upload/file/110826329759.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/91321846192.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/99476296989.pdfIn PDF document text
    • https://tmtteks.com/files/fixijakamazivenalowad.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/bapojojagilajojusukutide.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/mekibibojiwivug.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090a1fddcbc1---62325503815.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/tofepezizezibazujupixoxus.pdfIn PDF document text
    • https://bioesteticaonline.it/file/10681302208.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/5db271cbed0b13c52df8db55cb31960e/65467088120.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf04420bcc---sonudimodu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac0c35605---74286073934.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/durudawadadogakexifuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=irregular+past+tense+verbs+worksheet+3rd+gradePDF 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_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 11184 bytes
SHA-256: 85888efd3cebb1104c852b362ce4cc2f8dc6da68fc9478837c15154949efefa3
font_02_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 17264 bytes
SHA-256: a875d982c24ae50d7a5c674daea942a80d36908cfa8c28ed5c81bf5b0b109435