Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e855ad90aa6cc7f…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 18:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf5db313ffbbc19bbaca7a9754f4e43c SHA-1: 7c50e6b89d65ba1dc70b9306bdccbc318aee48bd SHA-256: 9e855ad90aa6cc7f3ff496a170a7bd03cd190d4780c9039d2666e44dfff79a7b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate that the PDF acts as a link farm, pointing to compromised WordPress upload storage and other disposable hosting sites. These links likely serve as lures for phishing or to download further malicious payloads, aligning with the ClamAV detection of a phishing trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3653

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2c0aa56f45cc7e1997e512cd187d91a6/4228800470.pdf In PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/julizepomokewoniruz.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8l0ff7mi0cdvkehkbq9gqlb4s3/29391768369.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/mirometidotufuvirawuf.pdfIn PDF document text
    • https://tepihtrava.rs/files/tifebomukaridiwagazis.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/zeporiwenapofuzigufewur.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613483302f52f---borodoxiwumi.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/kipodufimaxefelazusukobex.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/10647130028.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/domokavu.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/47590553382.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/nubugekira.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1b352217960fd557a21b686ea5847117/fofimilugonusuzafub.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/29345830619.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/82f70bfbe239509eaa6cf6b3d7f46b9e/63362502946.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/93992647020.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/likatowugusifozunawuzikaw.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/39ea0239cfea0de91d381604ba39cf1e/jiliwapori.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/13526016935.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/tujavawoxumasusorovosikev.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/89462195221.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/18308190740.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2cdd6d822---63315058705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=1337x+all+proxy+listPDF link annotation
    • http://forum-auto.ru/data/files/fexojijuko.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_off0000c0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CD 10400 bytes
SHA-256: 71fce77cdeebcb9c042aa28dc811a9c36a1f271c676dd480166d8c6cc3bb5f3d
font_01_sfnt_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 17016 bytes
SHA-256: 53e82e6a2c92a0207717d8c980cc0b07753ca8c13b847e39a62ee05e18212a85
font_02_sfnt_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1