Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bfca8dbb5a0876…

MALICIOUS

PDF

76.3 KB Created: 2021-08-14 11:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 726e4f7e83ec9055ecdf1830f3c5104a SHA-1: 02afa51f5228ec202f5b1d9a41847dd090ac19b0 SHA-256: 23bfca8dbb5a0876be1f3d49dab980348b78be3b672e7c05f49454e6f14c284d
124 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating an attempt to host malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The file's structure and numerous external links suggest it is designed to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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 http://www.impactit.in/ckfinder/userfiles/files/64282135378.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/g6fedfeedc38pkvv7fmcigru2j/89683707681.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c21350182c7---34725991819.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f82ef64ae9---62093123948.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/3119c9609e050a51eeedda12b7d77c23/55081326674.pdf
    • http://studiorestagno.eu/userfiles/files/23628564532.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/87433484873.pdf
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/6750280048.pdf
    • https://daaeportrett.no/upload/file/gufewowegusujewonakiraz.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b0144a81204---75549211875.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cf124cfc7---folikipedisa.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a13ab478d74---luxitof.pdf
    • https://beautyyaurient.com/editor_upload/file/tanugeduminivuvamuzixa.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae96abe0b5---pagijemamifugevararazagim.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/51394876340.pdf
    • http://beulahcooleycollection.com/clients/870349/File/vawiliwolozosovu.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b11157c2031---zorebapodupega.pdf
    • http://fandimnarodaku.cz/upload/file/96649366438.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cfea7a4ad9d15403d0c560cb0663838/vafaxolijelejujot.pdf
    • http://cdmatik.com/uploads/file/givukeba.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v4sdlukvhet917lj0rh6f91495/gokevunepufewobidarosu.pdf
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/junexomowebe.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a978d3f6---82335983537.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+charge+the+plantronics+voyager+5200
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbdf.bin
d4ab2d7f8158fe9ae575fa01dc385d493614b9d7eab8ee4ea07ac6bca7a9d1e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 17604 bytes
font_01_sfnt_off00010a01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 16792 bytes

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