Malicious PDF — malware analysis report

Static analysis result for SHA-256 aece5553b3a354c6…

MALICIOUS

PDF

76.0 KB Created: 2021-09-06 16:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be46032b2cbc576bfa10546fc8a7a3a0 SHA-1: db1bdb53da0473b6ab2a09dc75149a2dcc70d225 SHA-256: aece5553b3a354c6c33c0a4ded429822b11ce7a9e70d5baa5894acd17361c173
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbe775220a---12834292355.pdf
    • http://duocthientam.com/uploads/ckfinder/files/xarogaruwirulagagaripub.pdf
    • https://snqrsl.quebec/upload/editor/file/pevegiludotenusat.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc796acd7e---90764489343.pdf
    • http://www.pattyn360.com/upload/forum/files/sumulufixuzuk.pdf
    • http://webs123.com/userfiles/file/wikurokujofuvafinanotopu.pdf
    • https://anukulagrotech.com/userfiles/file/43301471665.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089c9b096586---26704145345.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad90cc0889c---raturozotaxut.pdf
    • http://tunglamgarden.com/images/fck/file/tibekuluw.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7037d79647---sidipinanig.pdf
    • https://elmawadah.com/userfiles/file/zegitilexubivoxad.pdf
    • http://weddingdiy.cc/uploadfiles/files/20210605_053115_1475.pdf
    • http://clubsahdianagalati.ro/upload/editor/file/wevurejinodadijefoz.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1621756280244.pdf
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/kugaginuvevesogisovajerok.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fce9e5fbb1---jeduraxufegodibo.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/45da597e3c15286815f852485b9c1c76/8346234666.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/oqeaou98mkkqqkte3p0l60i3bm/kuxalu.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/64ae392800f95f85b353264aeb2e6357/xuvelutisobesato.pdf
    • http://btc-ltd.com/upload/file/wupodakapimikor.pdf
    • http://thaoduocvn.com/userfiles/image/file/juwekixobodofi.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cff10e1e939---6882509072.pdf
    • http://modernplating.com/userfiles/file/83996943099.pdf
    • https://digireg.dk/upload/revopiramuz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tutorial+adobe+premiere+pro+cc+2015+bahasa+indonesia+pdf
    • 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_off0000c25e.bin
6d4cfd7b3c1809621230b9da1c85aa781cde6ddaf75e88ce15885c7196343cf9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC25E 11516 bytes
font_01_sfnt_off0000dd4c.bin
1bcc3c8cf22e17382737a8be06ee111a3cb1c9196a4cce8ff24f11998cc1f493
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 17148 bytes
font_02_sfnt_off00010966.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 16792 bytes