Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55730f7c1c772e1…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 12:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 678033ad9e4593d70013295c13b14442 SHA-1: 56e87e5bdaaec3414790e3f323d97f107292e988 SHA-256: c55730f7c1c772e16087cb2cd69e3e1bb08955466dbe01806e4b9fef01e43515
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. It functions as a link farm, directing users to numerous websites, some of which are hosted on compromised CMS uploads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ankamet.com/userfiles/file/81538363021.pdf In PDF document text
    • http://aliceinformaticasrl.com/user/pages/zipetex.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/24562032652.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/9049389730.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094858ed614c---58747582819.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/sedakafafazomuwigo.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/disudebebog.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e18d8d33ea---vasuked.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/xarowegifugosorodetoge.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ceef292a7---50326716886.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16127175387043---56059097779.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/36164291231.pdfIn PDF document text
    • http://topp.pl/_topp/file/56476164398.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/lenarurupaj.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210813013122.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/vezavomasir.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/98454230981.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/53395848627.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/6044891394.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/24316799310.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d979208174---tabexebusizuv.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/50402524294.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/r80u31bg72eiokq7f4rlmr0el9/56850213302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=data+mining+and+warehousing+books+pdf+free+downloadPDF 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_off0000bf20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 11364 bytes
SHA-256: 91cd8b6be909f8a92c9ef1143214fc3c3a69097c7961de7f8b5c6fb229c7f194
font_02_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 17876 bytes
SHA-256: 33b8c6136faedc52b729eff98991805d89cb48b84cb1f332e93ab1249be64fb2

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