Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4c40280582f4b5…

MALICIOUS

PDF

85.8 KB Created: 2021-08-09 20:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac9dde8536fe0de22b19f5e8f63b5bd4 SHA-1: cfacd1032cd3d8e45511f121e01117b95cf12916 SHA-256: 4e4c40280582f4b58c0ee46f4052bf48e2c7d8857d8fae64df34916d087b4812
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://aljazeerahdrilling.com/userfiles/files/bowilusu.pdf
    • https://elpollopaulino.com/cenavarra_userfiles/files/mutajedovigorafesewa.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8647443d52---mobupojute.pdf
    • https://kp-bs.ru/upload/files/xixujakenetadedurapizavi.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c63cbc86ec---52703569042.pdf
    • http://yourbuilding.ru/userfiles/files/30444946686.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc6101033c---jumijepefezujojisuzokokex.pdf
    • http://szpk.hu/_user/file/pipemiweluw.pdf
    • http://mobilenmr.com/files/files/zaxoxab.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/gaduzemejisojizerope.pdf
    • http://jjmcp.jp/userfiles/Image/file/98491488360.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b753b65fb02---39630174818.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/viboxebobi.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/f69dda48e70bd64962b52c0e923cce76/xuwimeluxolirixejiludaju.pdf
    • http://hattingtoemrerogsnedker.dk/userfiles/file/37445587376.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ae2b38c7d---naxejuxokevumamibarelutu.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8102027905---xesulozudebunafexugafujob.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d84edc10d5---kodufitifesowo.pdf
    • https://superpart.com/files/88608613036.pdf
    • http://veterina-hrib.cz/user-uploads/files/zozefanix.pdf
    • https://singlespeed-switzerland.ch/userfiles/files/nedibaxitowuposenavo.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ce720bc0cf6cc9fc826d560863147949/felivozaposufutabokimifes.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/cp9vclrvq9rnno8u6m8bcum1uf/jovenovojelilojokadosuk.pdf
    • http://aarogyamedico.com/userfiles/file/vujug.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16107998bc08b9---38435705292.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=crazy+pixel+apocalypse+unblocked+games+66
    • 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_off0000e715.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 16792 bytes
font_01_sfnt_off0000ff2c.bin
28ce101ec126a7a0869bffa33e1fd2f158f1051be2860fbcd63832985e9bb0cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 11564 bytes
font_02_sfnt_off00011a33.bin
9c7b30807e8449b6f1f7ed46d599dfc2e20e8fccf1c983f500387a24b3836094
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 17152 bytes