Malicious PDF — malware analysis report

Static analysis result for SHA-256 038d68b035ac0c31…

MALICIOUS

PDF

76.2 KB Created: 2021-08-20 19:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e6c4dfcd29b4f61ee201ac433b69c7b SHA-1: 9d09c66feca84f4e3870617861f8b1e802384e83 SHA-256: 038d68b035ac0c31a1b06b9f85709ed8892da7add6d95e08dd84e0e361d8a050
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6658

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/bd7360f6161ffdfa7ef88eacf9074f08/xujamu.pdf In PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/urve704n8e3b23ft5a48v6diek/felugejovujususiganuwukus.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/75047939730.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc55b75694---kejamakogitememuludekezu.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/16209298724.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/10176563075.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/miwibelafokeraguzav.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210627063130_bg4z18.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161038f7fd6b0e---43049925109.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/59790512709.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e1fdcb6954312beb16038c3940af4b8c/tuguzederotululufonakirav.pdfIn PDF document text
    • http://calebdobe.com/clients/875189/File/sorosanok.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9ea55befb---95032084678.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4ovfs3lf12j70cr6jcvq4k1vh3/25781296271.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/bc15c49a4b70b0e71fa47514e0c72c77/fojenobison.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/1cmrknd10ff8783pifu0lmm9a6/jawiguporevopiruzefi.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/batupatiwufamuwuva.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc88a7cff---6665498726.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/nogerad.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607975cdda9da---71453746269.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dbbljpi6qdrd9mi00stb9ris8u/joxufokuzenikesimikugo.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97059d98d0---sefuwuwomafukiluneduno.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/ronapizuxiz.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/215568007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=chemistry+class+10+chapter+1+question+answer+in+hindiPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 16964 bytes
SHA-256: f0139960138d8497b787da34b46b1374ca287d362d897d92e6cbe568a0bc8889
font_01_sfnt_off00010587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10587 11428 bytes
SHA-256: 788a03c7066cb4ce91e50be002d54a292f8a593fa1f4222070fffb76b1d6dd1e