Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba7bfd4105fc003…

MALICIOUS

PDF

75.6 KB Created: 2021-09-23 05:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2003671e9646fd222d5a271534d64297 SHA-1: c86b71674eb540c68f480c11e4b0f4ce1443f0a4 SHA-256: 6ba7bfd4105fc0038d716d03536ad8d371eac75331b090e5496fb5786db53506
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7745

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://pixomot.ru/uplcv?utm_term=signed+apk+not+installing+on+android+phone
    • https://towa-aaa.jp/userfiles/file/21574677553.pdf
    • https://sofupingame.com/calisma2/files/uploads/jisiwijegoguxewuviwuwin.pdf
    • http://murielbellhomes.com/userfiles/files/mural.pdf
    • http://zgic.ru/!upload/files/dimagafoji.pdf
    • http://caffepontoni.com/uploads/file/50839129270.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/48e7ba3b19e16d40e620fcd8a4635530/tanavemijusemalivudufuge.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6d7c40370---fakojira.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6a7254a8---20341060617.pdf
    • https://srmhomes.com/images/bulk_images/files/vagemuvapeker.pdf
    • http://atomicattack.com/atomic/fckimages/file/74197654037.pdf
    • http://www.firengo.com/userfiles/files/tunebetipipewiwofalo.pdf
    • https://micsys.in/userfiles/file/94962709295.pdf
    • http://polaryachts.com/res/wysiwyg/file/zovakobinedilok.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/59422421366.pdf
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/gofaxu.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/5c21c02702942599daa5d118a8a55548/farorakivozegepez.pdf
    • http://chiari-web.com/ckfinder/optimist/files/38214864934.pdf
    • http://engineersclasses4competition.com/files/others/mepodeze.pdf
    • http://gokea.org/upload/editor/files/12795470477.pdf
    • http://vipnjl.com/userfiles/files/22565371601.pdf
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/16419601866.pdf
    • http://buydecor.ru/uploads/files/kuwemadazije.pdf
    • https://jakspravnenapsa.cz/userfiles/file/nunimumiwilubawilefakel.pdf
    • https://abyway.lv/images/ck_images/files/95135540557.pdf
    • http://ottomaniantextile.com/userfiles/file/87920802271.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d539.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD539 16792 bytes
font_01_sfnt_off0000ed50.bin
a223ae398ddf8782b8290c1dfc1509f2b3d17602012be9a37d6fb288cd7e1572
pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 10836 bytes
font_02_sfnt_off000105fe.bin
9bd7fdf2b2322d176a1f6d4ef218be4aedb1a440727b8a9084882e8c0ee75587
pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 16516 bytes