Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6286bb7606ac5f…

MALICIOUS

PDF

95.6 KB Created: 2021-09-02 01:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4e6bfda7f06f77d5cc0e66247b74c260 SHA-1: 72f32313fcb259b40c065031ce8304e3b1e9bec2 SHA-256: 6c6286bb7606ac5f42f36be03500064e396cc850024791f88d16cc7d316207b0
126 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various websites, including those hosted on compromised CMS platforms, suggesting an attempt to manipulate search engine results or direct users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the link farm and potential phishing or SEO abuse attack pattern.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4250

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
  • 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://chcial.ru/uplcv?utm_term=best+pixelmon+seed+with+all+biomes PDF link annotation
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/68b64bce86ef9c4e22d0e1fb9f426427/xolulezadan.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/6356141404.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/vizurero.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867a508d63d---gesilelexo.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/totulex.pdfIn PDF document text
    • https://bloomeng.com/uploads/gubokoxixodujejona.pdfIn PDF document text
    • http://yuha.be/_files/file/kidako.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8kiu4c8p62lglgt8hqnr3dpdh3/78110122456.pdfIn PDF document text
    • https://pellevah.com/upload/files/55674354741.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/kopagopepixotejanoterufaf.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16116efbf60dc0---bozofibo.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9672b8bcd6---73423485648.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/84214585759.pdfIn PDF document text
    • http://landpas.pl/upload/file/62183211800.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/71a16e41be9d6dff3ab30321f598aff7/95147044437.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084126344295---60739697554.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/25210189281.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/lupasikepikizarakukalim.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/pegevonuvebut.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7a415765db1ca643d187017f9e0fc8d/ziwaparevibazobofoze.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/fetexitapixafotojizowunut.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/tezoraf.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/87156089201.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fd71a61d1---70492065954.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_off00011d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A7 18396 bytes
SHA-256: e3bb82fb38ad8a2c51ffd32a7a9bb9d1bf87197765a7e834bf1f2e1f465d805c
font_02_sfnt_off0001657a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1657A 10940 bytes
SHA-256: 657ad77dedd1099b873ff3afda657294f3ad1349708122834bd6f41d1ac242b2