Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2b31a4cd1c5b96…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 16:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ecb5cd9841e1962d9b6a81e69f449a93 SHA-1: 75f2fe5e661479ed2c5addc75e0b37555c701426 SHA-256: df2b31a4cd1c5b962af5709ba761b2b758e899c438aea569718f66652d69cf12
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://dentalclinicbangalore.com/uploads/53355535113.pdf In PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/xanuzazovegavegitofexop.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e910cfa757481a3664e0a731efdf461b/woniwakofesimizogitifojin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd02e210143---75273359304.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/gifuluv.pdfIn PDF document text
    • http://dges.in/userfiles/file/zodafuja.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/43692524469.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/jazewera.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/53820690902.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf716b13c---34368795413.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160894eed17e18---23960216045.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/59926035635.pdfIn PDF document text
    • http://seedcambodia.org/htdocs/cljr/data/files/vomowabitisosu.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/99768798912.pdfIn PDF document text
    • https://asken.as/bilder/file/96484257910.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/lufuzuwaf.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021082320034873499.pdfIn PDF document text
    • https://palet-school.com/files/files/karademelit.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210611_B86D7E52B53A66F1.pdfIn PDF document text
    • http://aplus.to/userfiles/file/10494732029.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/tirevuresapavow.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/40677231114.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/89536478108.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/22800507526.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/jobedikegisijuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=2011+golf+owners+manualPDF 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_off0000d69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 18028 bytes
SHA-256: 9e7973516c8db96b48306dca32fe6dfd7cb7dcff66dac2e164a7ca065ab82185
font_01_sfnt_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 10748 bytes
SHA-256: 08ab7fa45796f999da91c8b8db2bb1b1c55e0fddc733ccafc1b2f13efa9aaccd

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