Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ba1bd8f74a0de6…

MALICIOUS

PDF

70.9 KB Created: 2021-08-28 00:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4946733047b639650652f022ff9ca606 SHA-1: 5d9f93e6769eab6c9e799403016b97ce954283d6 SHA-256: c4ba1bd8f74a0de6b51fdc1ed9737d79d349b1cfb6e075d36b82c61521ecabfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and disposable hosting sites. The presence of these links suggests an effort to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://thaisomboonautopart.com/userfiles/files/xiwarovuwojexi.pdf In PDF document text
    • http://dansensvenner.dk/imagesfile///zazitiveja.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/061c80f09bdbb5e76da0ea4cdf05b94a/43996607031.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/43565781794.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff62f66b1f---lopimutikir.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/bakubarekolevuralejerijew.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/6g0slo374e2nlp1tsdkkfqah8s/19747416389.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/56870363927.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/54214417481.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b16c0912c5f---37402674694.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/pujude.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/mawajuvi.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/puribimurepitagulubove.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/26cfed8cfd0197fb7123b003fd05c850/42195250441.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/pslnf88o94updubu4126v7ef7k/33726583419.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0f0e2c56---sekufopubilufepenupisef.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/1982650866.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/45585204521.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/sazovuma.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/108a60d28367dd77e14722b0b6e3802a/8778364956.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/9066810065.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e83f4bcdf8---zojetaxugavu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a524d0d8f21---bebowa.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/kuminimaxelekolono.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16208634602592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=class+8+math+chapter+1+mcq+question+with+answerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB715 14580 bytes
SHA-256: 6ee85c730b0ee6388ca63972fe870970cebd7959477e75e7d02811352eb622f7
font_01_sfnt_off0000dbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 11260 bytes
SHA-256: a8234d23285178060d4ce5559d7e81c6d8a9a0e63fcc050cd5c4602cdbf587d3