Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b2424fb8eb1d3a…

MALICIOUS

PDF

84.2 KB Created: 2021-07-24 14:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a7d1ef1636d1d79ccc895bd6a33d71a SHA-1: 6505ad4bd2a43be5e7f40077554a6730282676a2 SHA-256: f9b2424fb8eb1d3afe5826fa62d3dc9c900ae2184cd4a9b37d0c2de06ddb06d0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://hosvagyok.hu/userfiles/file/xubofuve.pdf In PDF document text
    • http://altelaw.com/uploads/image/file/33482761412.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082f72f47ec0---9417976990.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/74gmqb18ckklht6dn0tf6i48u8/nujilizidaful.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/37be99a54e3ea9dd780571041ed483c5/19394223880.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/te9o6hqs41knicaq869fpheo5u/35102723531.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/wadobadipoj.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/xitajufo.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/56679923331.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10dfa39b79---62109228628.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9346859762892aa9c4d9c89b8586e868/zumaxorazop.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/redizetaguxeje.pdfIn PDF document text
    • https://windsbs.biz/files/file/15523571160.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2595f244a980eb83eebb0a67ec924362/riwowusobatanumukisalu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075895bebbee---61098922331.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/jukixulipagipikesibeturep.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/lsm6j70ghlpeg0hm510hhhbrtb/sumagegexujidozamazivab.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c337b026fa---78443236037.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073632fb59e3---sagalalebuwaxegujo.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/xuneridepudimo.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/74531524225.pdfIn PDF document text
    • http://risme.vn/files/sozijenagavijezesijanelug.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc879a55bf---boleseledurara.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ad13861f---48224245960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ramayanam+story+in+tamil+full+moviePDF 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_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 10700 bytes
SHA-256: 974d8effeed2efaa25dce162aedb24bbffe2891f26cde580581a6c15b6bd6672
font_01_sfnt_off0000fed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EB 16892 bytes
SHA-256: c94da42f4a8da4dcbc146025b1e8e98e50f77e079efae70ee7687cbf396a42f0