Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafcdbc5293d11f2…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 06:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9eabf3e98ef504e40c92486a6b146049 SHA-1: 8cb96d91838f0bb1df5cd2f73b0f7b6434fb7663 SHA-256: cafcdbc5293d11f24a83139a090810a0687baf725c062fb36022d510c4e57d29
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous external URLs embedded within the PDF. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many links on disposable domains, often used to redirect users to malicious sites. The presence of embedded URLs suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier clean score 0.1709

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=battlegrounds+2d+io PDF link annotation
    • https://123natura.com/stockages/files/linatuvikituzo.pdfIn PDF document text
    • http://mylodge-naoshima.com/wetipidusutofugo.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/27826802126.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/zujevageromotuziniweza.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/puvumunabopove.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/79669087080.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/86996826665.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/mewasomagiduxadag.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/99803367642.pdfIn PDF document text
    • http://topflexsports.com/uploads/90470285945.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210908131503.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/potiwibedevumarizif.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/25543972429.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/45094218656.pdfIn PDF document text
    • http://sun-eko.eu/files/file/sijalisilekirijevomezapu.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/peribopotikitojara.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/68395139052.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/jimanipiwetejoku.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/39918504310.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143dc136bcaf---87585161977.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/voxejesanijaxumoko.pdfIn PDF document text
    • http://drironcat.com/images/file/tazagagetujegasotixog.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/mejavunejavutulamusefi.pdfIn PDF document text
    • https://kralpin.com/calisma2/files/uploads/bonevosukup.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/ludulisufimijanej.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/wukizexesovobisabus.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_off0000ccd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD3 20244 bytes
SHA-256: eebfc88052f592d20d57efd71f984248f96b0ad020d83d033aa8148a05f30d72
font_01_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 10696 bytes
SHA-256: e1dddf4cd8c674e383c652ae197f9464427d4512c482f163e2250df064a9bfd8
font_02_sfnt_off000118f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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