Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95487c301b002e4…

MALICIOUS

PDF

74.6 KB Created: 2021-10-08 13:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4a95f3ca306e62e35131722bb51201df SHA-1: 10492f69f1d900c5bfad415c6073e20ea67bb8ec SHA-256: c95487c301b002e44c2ac0c9323f59f4e494fe0696095e4bbfba2f48cfadbfb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/keledugumuxavelikozifoxok.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/42d61d1c9e6d59f3624be9ed876d96cb/woratofulitoxexulove.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e78tu7kpsbm0fh5qn8cgu49qq1/dowevowusowavozuwusaga.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161539c4560ea8---suvexuvu.pdfIn PDF document text
    • https://dacola.com/upload/files/welizuvis.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/627551690.pdfIn PDF document text
    • http://wwsm-us.com/files/file/suvegitozemid.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109070813033844.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/zagolo.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/40313317253.pdfIn PDF document text
    • http://domario.ru/userfiles/file/vobidezopujarunumifi.pdfIn PDF document text
    • https://regenerateacademy.com/file/genisuvafafib.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210927212943.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/86152735109.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/0ea99d8bfa5dd14d135052157948dd57/lurowipibube.pdfIn PDF document text
    • https://costarica4d.com/contents/files/xolivuv.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/sozokizafoja.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bbbe4f277---10471801723.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/90067428918.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/jijipuxoju.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/wenuladeg.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/rigoluwa.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/81334722306.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/megenatosibegi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/df2b0e58430a4e3c3eab34426af3830e/kimimesafasovipefaxo.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613de2997b2bd---fubemifukipoduvu.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/70008773563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=bfa+alchemy+leveling+guidePDF 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_off0000bff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 10768 bytes
SHA-256: 0549fa9275a1455b89dbea9925ff626913ee2ffaf8404454ac2ef368d174b781
font_02_sfnt_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 17452 bytes
SHA-256: cd0ba00ba50c60f9e1ca9139eab39d4d1169761d2f26f0722ef6155d8f74dcf5