Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9bc0994915a0c77…

MALICIOUS

PDF

88.6 KB Created: 2021-09-07 04:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e602fc20e179caa1c5c06baf1487099c SHA-1: 6ecb764d6ba59564c395a12ed19201a96d90ee6d SHA-256: d9bc0994915a0c776f282fc53664be79b20829fa98f6829edf11cd66184b5eab
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fkhd.cz/data/img/dagevekiburaxadaz.pdf In PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/58286857404.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7329877f48b6fd71ddfcdefc3ea60dfa/30494820845.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5748c7b2b5---4906348073.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e3bcd4eb9---luzifufe.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/mawabuwemape.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/dofivoronixuru.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/14135249906.pdfIn PDF document text
    • https://limadelimon.com/images/file/32269082338.pdfIn PDF document text
    • http://scsytech.com/upload/files/86814484518.pdfIn PDF document text
    • http://fruitvita.com/files/files/ketenuxomizidi.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/56628549772.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119b7f93c752---gegusa.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/lokoxudinepib.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f35346c18---tunad.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/34752597907.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/totolatapagufejizagewi.pdfIn PDF document text
    • http://ilovemynewstemcells.com/clients/865932/File/75134062724.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076695fd86e9---wetepodim.pdfIn PDF document text
    • http://handgun.ee/media/file/48766357285.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b77163d3d0c60e9b05d1febd87ad51a2/mepupexorawitenuxezufozop.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/11672296553.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/genezit.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naxekepinapaguzudejamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ascii+code+table+pdf+downloadPDF 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_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 10720 bytes
SHA-256: 26d9857aca34ccc375e76be08a43729c409791c7633614c44d8fa1cdb3683204
font_01_sfnt_off0000fe94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 23036 bytes
SHA-256: d1915f323230b050dcd27a66710e4a4bd0c38d0cc53b42386878c1e35eba75af
font_02_sfnt_off00013ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1