Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51efec0735b9b1c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-24 06:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 717ec797e68d1adb86d9d15b32929eb6 SHA-1: dfba853baa945f3805afc1b9addbda64fac0f544 SHA-256: d51efec0735b9b1c92cc27e7812f01931d5d186e09a4e36d38770394e03b76e8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://philabc.ru/uplcv?utm_term=how+to+unlock+mi+phone+pattern+without+losing+data PDF link annotation
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/0cf783f7b167d1d3f3408b3d27c8e054/90203641010.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/65312872461.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/xatekamelizotibawu.pdfIn PDF document text
    • https://clickbox.ro/images/file/dujigajimidamojetizesox.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/godonenaledigimif.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/ferateposanubafupolisa.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/vixeje.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210906_092842_150.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/wowot.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/zomoweludigadiwevifokatum.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/3866539466.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f085edef6---65796229210.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/kudotarububetiluge.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/50465971153.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5aa611d54---fatujopekoveko.pdfIn PDF document text
    • https://ocw.tw/uploads/files/gogumipumijowi.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/79314354206.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/1777814465.pdfIn PDF document text
    • http://husplaza.hu/editor_up/dujogolive.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/kodaji.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/xutunimavimepoboxume.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/panofedasano.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/71971249671.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_off0000ce15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 17596 bytes
SHA-256: 2f3d7eaccf7a22e2c042a0e3027c939d402f349cbf8fe9d4025dd9e7d348f4c6
font_02_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 11228 bytes
SHA-256: e638775b869756a15960f9bbe0567ee19725de8df6def683399157bb98678706