Malicious PDF — malware analysis report

Static analysis result for SHA-256 714f12924b96fd34…

MALICIOUS

PDF

70.6 KB Created: 2021-09-15 03:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04af017bd22fe8ffca1b068d06a2a6ae SHA-1: 79a1c502677fd16c6dbaeb01619661a8cc503f4a SHA-256: 714f12924b96fd34ef8b4d1b16630e4ae3c38108d94621add010c8c5c4ae4569
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV. It contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute further malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using algorithmically generated URLs and link farms for distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3616

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://apart1day.ru/file/bigovo.pdf In PDF document text
    • http://cke.hk/userfiles/kamome.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/80604380049.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/50250573413e439ad6e6083170313e9b/2132100212.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210901083555.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/6bef9283e3626a43d030931eaf0329e3/rirupuvivenarok.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/31855441633.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/76557083292.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/58775599446.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/somojamidixiraxovibunixe.pdfIn PDF document text
    • http://acelybio.com/upload/files/mazadakupowoditawekipekon.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e4df5369b75942ac8d04dcbe0218768f/sotexekij.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/43897667690.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/35132256627.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/96672824204.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412393cb724---78485362646.pdfIn PDF document text
    • http://belst.by/upload/file/rebaxoxipududunoxagobu.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/83094551388.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/vakapi.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141134ca2801---jujojifulajufagemebikesep.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136edafa6c86---semedujosebewasawizi.pdfIn PDF document text
    • http://packamate.com/userfiles/21320057044.pdfIn PDF document text
    • http://saint-party.com/media/file/liwakuguwamosin.pdfIn PDF document text
    • https://triosms.com/userfiles/file/19050169492.pdfIn PDF document text
    • http://telektrans.hu/editor_up/57968979216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=compare+poco+x3+and+redmi+note+9+pro+maxPDF link annotation
    • 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_off0000ba05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA05 17060 bytes
SHA-256: 5dd40d45b2d59637598f6f4eb7d750d913f552dbc9125537722ad71b6fba32a9
font_01_sfnt_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 10932 bytes
SHA-256: f1bc20bfe7dbcdebd564cff6a4e6c6b73c7fcd694af21abd171eec56c10b75a8

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