Malicious PDF — malware analysis report

Static analysis result for SHA-256 8479826e164bd42c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 00:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1635fc77fc71334705cd097a7477e1e8 SHA-1: 08f7442a518f37d9ed61e3409c1b8a49d512a163 SHA-256: 8479826e164bd42cf3eede651dd224bdaf94e4d5b6fd87fc6150a28fa97daf37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/21656386014.pdf In PDF document text
    • http://actlogistic.vn/upload/editor/files/76686939364.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d83f40f9---1700650297.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/4404781604.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/74641551824.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/82833574750.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/bejesewefozowasolofupugo.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/fefigetufutuxajokoneg.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/dazoripizikokizukimu.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/83477248880.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/3935593253.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/81333078320.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210904004308_1899626140.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16139468ec577d---97529856960.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/k5imer4ksdm3qi26r3qljpr2nh/lesuzulumokederoga.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/30065838854.pdfIn PDF document text
    • https://nexusmediation.nl/files/76917112732.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/xibavinurewopugarasoda.pdfIn PDF document text
    • https://slide-bearing.com/d/files/94474425103.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161325d8b18c7e---zivozex.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/wikosove.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/60575457298.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/rawatusemufenamavomada.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/nuvazutefudizewa.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/50029929963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=soft+aim+hacks+fortnitePDF 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_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 18460 bytes
SHA-256: 12de47404444123a166fa10404e655f2856f19c27ebaf5d727ccf61d1ffd59d0
font_02_sfnt_off00012a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A23 10724 bytes
SHA-256: 694c0c951d4c0da06ffc803310d0236fe6285f99fc8add5f275b92bcc8af39ae