Malicious PDF — malware analysis report

Static analysis result for SHA-256 47fd508f0ed7cfdb…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 17:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45bee0fec63ae1672a3f2e40603a53d0 SHA-1: 8f95418a9b6d03b9a446bd06080385b841ffc2f7 SHA-256: 47fd508f0ed7cfdba1202c307306822d695ca94e5cae38a89750582c4a112c3a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous external links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/zanexabesedokofipusiw.pdf In PDF document text
    • https://markyatirim.com/resimler/files/74052927115.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/29747209657.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/buwijowutopidewalexopit.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161324e1379829---91797585647.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/39206cd0fa57a1231b785ee15ab6b25f/52866478953.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/20204119627.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/walinupujamojibe.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210901073708.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/49607267851.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/77819905036.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/69707761338.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/56248501336.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/58386248367.pdfIn PDF document text
    • https://servauto.fr/img/user/file/62410818426.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/82944676591.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/kejurufadutozo.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/99854429919.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/neduviz.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/xejatikogezaturujavutex.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95b377a73c6ee5e5bd2ab16b042fc55f/tizewaditujarana.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/zivaribuxunogo.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/29446995063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=alarm+clock+xtreme+%26+timerPDF 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_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 18456 bytes
SHA-256: 39ad424d90d89d638ec5e81c4fd37ae36be65c2ffeb50c572ba08224e344f095
font_01_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 10200 bytes
SHA-256: dbb1754209b409e1b2a05b224a9cf2551dc99f2b59ecd5ab57d249a64cf4b64c
font_02_sfnt_off00012012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1