Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89fde934981bc3b…

MALICIOUS

PDF

160.0 KB Created: 2021-07-30 07:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0708739d94d83b96a2469aacb372906e SHA-1: fad242fe6ec0f2f4f6c9ef8e55c300f407d25ded SHA-256: b89fde934981bc3b1555c75b6c6c729990d2a3761de4bed8899627d060544623
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5529

Heuristics 5

  • 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
  • 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://tele-video.ru/upload/files/vifisusiwivoxopu.pdf In PDF document text
    • http://sbox-technology.com/upload/datoteke/kitojuwisokowuzobixubuxat.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8f18290b59ed9b7efcd2a1cd01d8d5da/lobuw.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc9dd2c758---56435856864.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160984c2677756---fenuw.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/47104060493.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/zejupogijuvoji.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/foxewovepetaw.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f512dc212e0---50364474630.pdfIn PDF document text
    • http://bienbao.net/uploads/files/gumotunoguvanekokomatuta.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609461705ddec---pedawarowageza.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b862d0e0b42741b271ae737f402bb91b/faxekeparix.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160926d7a02bd5---31712665468.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607321bd98bcf---zuziwidixotokuragiwix.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bad9fc9a611---vuzubo.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/vijixawofuxesavo.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/76544990760.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/db42a3bd7bf249b627c4fcb9989951fc/30743485905.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/97288237686.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/68975049258.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210714_132907.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/5532194369.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/sewala.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/xunuwugekafijoruxorep.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/80770416656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=megaman+zero+cyber+elf+guidePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22EC1 10960 bytes
SHA-256: 84262f3ed1b0dc1358c2fbf7d9c8a41f6c1ebfd4743d517a692da44dc876dfc0
font_01_sfnt_off000247ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x247ED 18160 bytes
SHA-256: 354ba38ae903f620eaf11e4e91de907bb4f02e6658695c4eac12ada8056cd6d4