Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a17d3429377bc8a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 20:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 988940c511299467a4950f04603113ee SHA-1: 2bddd6bc834c0bafa24e15666ac1e508178aec15 SHA-256: 6a17d3429377bc8ac4ebb8500fcdc28db8790ebd324dcf72f9dc0b16dfb3fd84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to potentially compromised websites or disposable hosting. The presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=apps+mais+uteis+android PDF link annotation
    • http://yourbuilding.ru/userfiles/files/wemaxidovimokafonuk.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/6366414929.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/80047654352.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/10789038315.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f3eee5f4f8ccfb2101e43514bc1de190/65155443384.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/tipilabuj.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/a8ac399b238951243b47157f4c83ad2e/lunevuxesodalirevulisow.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/15292342258.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202108311935301335.pdfIn PDF document text
    • https://12waktu.com/contents/files/sonevusa.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140973da9d76---17646983101.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/punoxelidixaladegipevume.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/zepovaku.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9f90288a---96647614384.pdfIn PDF document text
    • https://chptravel.ir/data/file/jutiveluvuwori.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/xedutu.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/zunujikopafanena.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090915093177.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/gidusewumugupijegesi.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/pizaxupiraxebukutikubetef.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161375190d7d07---janekanu.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dolulasazuniwavij.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kafuxazotekasetiw.pdfIn PDF document text
    • 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_off0000dc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0B 10588 bytes
SHA-256: b446f40110e21202ea626dffc81ae5e2bc886e5911ae8964f555189d00e23702
font_01_sfnt_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 17432 bytes
SHA-256: d15c69cbe8bbafaf31fd1e2f60bae6aa0650442d49f9762b6f54fe5a877b064b
font_02_sfnt_off00012094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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