Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82a363bd0220e91…

MALICIOUS

PDF

87.1 KB Created: 2021-07-03 09:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a26560b554777e28c726f0e38c405574 SHA-1: 49405afb856e1062b04c64cdb39356d9539208f4 SHA-256: b82a363bd0220e9141fcdb1ae9e2afade065ace785f4f13de4d78f39d99d278a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b8654843a---76569513920.pdf In PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/k7s5pmeisk9uvu6u84rlcnb9eh/82623246444.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/43e7239ae14333bee447388ee59f19e1/64911275802.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/robepisupasizog.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/3lfvqomhceujctj9n5cq78t900/71613377828.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/6b3ugfh3tkvej1q5hic2lr0bg6/69472394073.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/0bas89pkmgf4eh6i84931r2sqf/tukodoxepudodixex.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fb8a22a7b---kovaromim.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/9956837140.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/5e76f01004ab07a954c4332eed6eef92/65168873131.pdfIn PDF document text
    • https://promtong.com/promtong/temp/file/suropivadovojalagukiba.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/81620345304.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/61572016584.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083532b6b15d---vobijulevawago.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082c72ad040a---39410943945.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/f6c800c1f50d1972edb8219fdbd28b9b/50926131106.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/cf8eb264bc3a5c60c2d04aa557ab37bf/85033236234.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3c7f9f84d---54967911854.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d40c391ead---gofisowokilujaxikagiwim.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/92003887765.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/779e75600094edba073e891fe467c80d/98841100564.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845b80c7a70---23973316181.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac85d2ae12d---sotagamawolufovotipat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=meaning+of+network+operating+systemPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 10940 bytes
SHA-256: 5f95203db4d3c73990a893d9c17c121508ec8d3c7af62c802f610522f9d0b9f2
font_01_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 17232 bytes
SHA-256: 09a4d345dba9b59cb767d928bd8709a25a086a13e9d955f73a165e7307e4a36e
font_02_sfnt_off000136d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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