Malicious PDF — malware analysis report

Static analysis result for SHA-256 4542d841c2171cfe…

MALICIOUS

PDF

95.8 KB Created: 2021-08-04 19:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d0790082a295377f6ef4837a1021b89a SHA-1: a4dcc8050f0da04f85c500a25be3a49ff5fd9c72 SHA-256: 4542d841c2171cfe48fb6b193e14d5d3ee1d1147cb6508e019a6cd5651075438
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised websites, likely intended to trick users into downloading further malware or engaging in phishing activities. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/caae12e2956f90c2b448597f813898df/pufimofu.pdf In PDF document text
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/23257375122.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2b6bca6b2bd0679b342f5d1fa4129a10/91122766489.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/42964946388.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/f5d422a82ec8a8ed05b5591b60d09f90/94059482081.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c902976e3---55137696182.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/fdcb840016f10c19f9a90c16f68fe43b/79767824128.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608311e05c6b5---nizogigimujani.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/4nubam0u5hhkomtuj2vislgu36/mupig.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/30222163509.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/p73tipciu6q8mvglgl937ggcot/vudek.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/tetinijuxusamijebisi.pdfIn PDF document text
    • http://pattersonandoliphantfamily.com/clients/875492/File/tadutoxuzixipisidoxofuf.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/93833600048.pdfIn PDF document text
    • http://toonesk.com/upload/vilezozoreramixejiku.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/70894867114.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/ed03d8702653d11351d3002f58c938dc/rufisevaxulanidexumikuvip.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a1b6d54e6c92e40862f86aaac05d8dd6/nafalopirugesel.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5201411546---sixuzijunonosi.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/felubituz.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c96ee1a5db7---83758894377.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160faee35b39c8---fokisuwuziwag.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/190217117236.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c99b0c5bc8---ravimiwi.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cfd3a997c1e---kudidajafujobamekujil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=kabir+singh+full+movie+download+mp4+720p+filmywapPDF 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_off00010e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E46 11716 bytes
SHA-256: d637905042f74a34415a24550f9bbc3ca0ec3c43bd20adbd8d035a3164ebc436
font_01_sfnt_off000129c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D7 17988 bytes
SHA-256: 59c2790c4bed6c783bca5c784d55050c998a66217cabc0f02fe879581ca31ba7

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