Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3fe1f19778bf44…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 16:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1796e95e98f4c082e6eec8066a7c1ef6 SHA-1: 48afafecdd10767c56294b28eec61c2ba2eb215b SHA-256: 6d3fe1f19778bf445f1f50bbd73400ebfcb590a22b78b13d9f01f0d1e4ee44f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or phishing pages, such as the one found at 'https://cructi.ru/uplcv?utm_term=among+us+mod+menu+android'. The presence of multiple external URIs and link farm heuristics suggests the primary purpose is to redirect users to malicious content, likely as part of a phishing campaign or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://cructi.ru/uplcv?utm_term=among+us+mod+menu+android PDF link annotation
    • http://quimicahj.com/admin/userfiles/userfiles/file/kosuxemasizebefuvelalepib.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/51399619679.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/78a2ee2fe2ff61266e94a40575be6da0/lifufavamekose.pdfIn PDF document text
    • http://serting.eu/userfiles/files/suguzoku.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/63388455339.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/bebezukawanerajikitosi.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/watovama.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/64345347030.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/74502826605.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/warejedirizasusanoxevaw.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/debutinig.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/zuverewulezatelutapo.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/71687716682.pdfIn PDF document text
    • https://dacola.com/upload/files/tigej.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351f286f9f7---zurusakezezabus.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/98209304694.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/27237025434.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/rekawikufe.pdfIn PDF document text
    • http://ccadl.com/files/20210911223629.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7238b1962---bofajum.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/ridulolip.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/78b330990a1e4d7fdc370304a0d0a29b/64593482027.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/bemolasemovir.pdfIn PDF document text
    • https://pecsikult.hu/files/file/99024352071.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/9361956422.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409071de9f2---33691848802.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_off0000d512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD512 18176 bytes
SHA-256: fe96dd268efa43c98bc5e45ba337d225906630112e234f32c6482ca252807b25
font_01_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEE 10528 bytes
SHA-256: 83997f9c357a50df03a5cae26386500069ccc95c3a7bad58fdbbbc9209bbc35c

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