Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9443a1a3375b7e…

MALICIOUS

PDF

75.1 KB Created: 2021-09-12 21:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7160ac7cbb557013719183e97c734a9 SHA-1: 316ec1d1d62fdad489d536f4ea302d57160c1fed SHA-256: 3a9443a1a3375b7efbbaed7f92e624320b143d8b6e5d5bdb2631188506232909
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. These URLs likely lead to phishing sites or malware downloads, indicating a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161387da92867f---72376009674.pdf In PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd4712633---7923604309.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/45161769621.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/saforeg.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/sotadokadoparuvipame.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/80190653468.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/mivibijukokenekunirodev.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210909175418_742089906.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/55438690103.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///20219285644706.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/rosag.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/lexogivedajajuj.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137916b27400---40612955590.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/70733365235.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/93961907013.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090810331889.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/32312115555.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/xixivonelagesudujajagu.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/44681432052.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/85031183517.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a0c6672d---zovadedorewekixibag.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/90947255435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+poonam+pandey+app+apkPDF 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_off0000c180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC180 10320 bytes
SHA-256: aa4ccb6a8a55095f85dcb33b1f155f4937d0fb23c13786089a64f611b0f8bd99
font_01_sfnt_off0000d88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88A 18080 bytes
SHA-256: abe9f856d2cd83715f2e89147266bc4bd60d135dd25517d418d868ef0e9b4a93
font_02_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1