Malicious PDF — malware analysis report

Static analysis result for SHA-256 2173d1d3b62231ab…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 12:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef7409ae419a7dda20ae77223a83838c SHA-1: a985c046460a2ed87cb7e3ebdbe55b8b374cacad SHA-256: 2173d1d3b62231abdab901057db366322d801f1bb64e092cc8a3b31647ff4200
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns align with common tactics for distributing malicious payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://prochem.vn/images/uploads/files/kigudomopowozi.pdf In PDF document text
    • http://newgrids.com/userfiles/file/wemivitos.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/xaliz.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/fanilul.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/xirufumewadizojud.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/60179309801.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/77652331395.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/78898739995.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/40559254120.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/wepulesi.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/5918164243.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/zuwap.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/30243626758.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae6207460---turamot.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/82033885297.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd1fb35fa5---bovuditapikajunonezexak.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/87628804876.pdfIn PDF document text
    • https://airbays.com/userfiles/file/56936938970.pdfIn PDF document text
    • https://magerp.org/upload/files/tajepufidudajuvajixa.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353ae496b29---pifanufenedawoze.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/boduf.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/rizagopuke.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/38569349427.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/55019954257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=simulador+de+guitarra+para+androidPDF 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_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 10744 bytes
SHA-256: 90f28c9c9f866b2a0fb7f9a2654553ce8f4d6f723bdd79c488679498040fd41e
font_01_sfnt_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 20276 bytes
SHA-256: bb23b173f979c2f9c7529a6b0c29fc88f959051babab7ca2f5b12faf3eb2a94a
font_02_sfnt_off000127ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1