Malicious PDF — malware analysis report

Static analysis result for SHA-256 53290aaea9335d4b…

MALICIOUS

PDF

86.0 KB Created: 2021-07-30 12:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a8a8a7d22fd7217d3fa249e4aca41c1 SHA-1: 93886a1cdc6f1756a647d4d5aea0f44e010dba42 SHA-256: 53290aaea9335d4b4617744a644e7365c4834941a7e36029156d59c72264a5bd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of 'cmd' in the document text, alongside the external links, points towards potential command execution or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9527

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://nomylo.ru/uplcv?utm_term=how+to+get+robux+free+code PDF link annotation
    • https://cgeminfos.ma/upload/file/32232870596.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962813ca5c3---37868586892.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/zelejusu.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/4799732538.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/a35d0eb4948d46c901770e802ac27a1e/mutevafi.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608647041bb13---23473590119.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2af662a92---xefetukan.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/23836094863.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/47307257505.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160810157e4efd---mozebor.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kefixefexasofopenadumix.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210730_090404.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/xonaxudupuzinokeramun.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160941e73f3dc5---28709336624.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/khhtu7von6stbpqc8v1oek61q0/67592062957.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/16199396441.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b580db97dfea45e0cb7756f1de3e3d85/fazesemadipovirararasaj.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081b93464c1e---5019254231.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/cb543f4968df3c3a7922cff2f909bb6e/fapedibozutajarige.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2fbf4e028548a1709f52bdb3fe7b680f/dopelefogazik.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/9cmdrjphub3n2oeb0cfch767fc/rorokonapiselasagez.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210508110845167.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1876085080---gumapegizebekazikivov.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/93665704746.pdfIn 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_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 10496 bytes
SHA-256: de2538ca633239a01f8d014a9b3500b1ea64a61c984b1853e01c049436936572
font_01_sfnt_off00010e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6A 17700 bytes
SHA-256: 4db65a1acdf71c4fc9fd4c0e31255f5e59c5be8bd8d054461573026423da7891
font_02_sfnt_off00013cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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