Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd560c0706a20b57…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 20:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1f89af316eff9d53c2c742feaff7c15 SHA-1: d842f6bf340c358b880ae2ba89b81c47b01473b5 SHA-256: fd560c0706a20b57d781ff9e59d148dfa96fcac74648fcbbb910c94cc0d12b36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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 https://abcoegypt.com/userfiles/files/zowogulutot.pdf
    • http://flapboxes.custompackageboxes.com/userfiles/files/fakukubisiluzijewos.pdf
    • http://pincodehub.in/userfiles/file/xadifuvama.pdf
    • http://shanghaicruiseparty.com/uploads/file/4207735499.pdf
    • http://shinies.ru/img/lib/file/31509578285.pdf
    • https://voxel-avocats.fr/uploads/file/
    • http://tongshengchem.com/ckfinder/userfiles/files/6270768398.pdf
    • http://synerfreight.com/syner_upload/images/files/pivedewepatipojo.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c290370e9---zexuxagafosevikawutug.pdf
    • http://daisin1977.com/js/upload/files/vanigogomugemanowezeture.pdf
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/53010764663.pdf
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/gigasokunisiruvewiwukik.pdf
    • https://camphacement.vn/upload/files/lobiwedideporupo.pdf
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/riwuga.pdf
    • http://okna-stv.ru/userfiles/files/47858765893.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a2780f9bb---60270200869.pdf
    • https://editionsitaliques.com/userfiles/file/kupitekolexoxo.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b75865eb5f---76526572978.pdf
    • http://119pump.net/d/files/42927190084.pdf
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/27093420735.pdf
    • https://cissud.it/uploads/ck_editor/files/vujitopo.pdf
    • http://smsgurugram.com/miet/assets/files/nasezitukikuretarem.pdf
    • http://niezapominajkowo.eu/userfiles/file/28141376765.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=top+followers+on+instagram+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000b226.bin
2a3cb8e2ba3dc68ee1c3ffdc3d74af3995260cd89eb1f35f87c4899b9f21ce34
pdf-font-stream PDF embedded font (sfnt) at offset 0xB226 10980 bytes
font_01_sfnt_off0000cb82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB82 16792 bytes
font_02_sfnt_off0000e394.bin
08d986163496ea348f8fe169025f3a59258e0daca7f4e1c3659c2d5ed1b03a80
pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 17596 bytes