Malicious PDF — malware analysis report

Static analysis result for SHA-256 081ff80c2a0c693a…

MALICIOUS

PDF

89.9 KB Created: 2021-08-04 17:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 347fd14f80c87f332fa1b6c9b0d68908 SHA-1: 78fecc2faacdafc81116dd65b5530bc16a1f9934 SHA-256: 081ff80c2a0c693a6c1886295fbad8a809405c0cc9e7b336ba6dc80957f97e5c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.egavilanes.com/ckfinder/userfiles/files/73233077797.pdf In PDF document text
    • https://lose-weight.tw/upload/files/33535593446.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/worumugubobagagogemazeret.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/zufelobuvodurepuzaf.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/21718421378.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/8854325614.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3b36af78a---62064999330.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f457f81581---xubobodixowugivuzilopuko.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b95b9252fc6---98078380709.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/josisaxarutib.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/cr971psmg6e4boas6ltsbeib04/mawuzikegipodim.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/43334207347.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d96bb4159ecefe0dfad1aa2092086ae2/51686673091.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/75879712796.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0fb6e5e1---53771474864.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098944db5fed---mumilifufezujekerinu.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/11b017285fb6b5d489751af67ad8ed9d/jimutilifaxukakug.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/40777339893.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ig1vsuo24j61c6vs8tp4mos5o6/jejokonuw.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/kikipoku.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081027fc4a56---2944490446.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/tinewaloruzobivo.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607cde52d1d81---63120943360.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/pasiki.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/75800691369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fallout+shelter+mod+apk+unlimited+everything+iosPDF 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_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 11188 bytes
SHA-256: 78ed7578b75fbcb56d5eac55b730f098b9ca409ca3b3b1c9e882951c31c051c1
font_02_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 17928 bytes
SHA-256: 8f85cc0f0121b2916f5d2b6cbeb69f4f58d9702af138f311789b4a932edad4cc

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