Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e768bf7b4a7370…

MALICIOUS

PDF

93.9 KB Created: 2021-07-21 00:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c62aa230d8f06aa029f87c712ea10167 SHA-1: cd4dda78f73c7a95462f755514297fcd2c737eed SHA-256: d2e768bf7b4a73702909e701246fe21704a2f22177523d4686bc30a52c3318fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external links indicates an attempt to lead the user away from the document to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://299-45.com/CKEdit/upload/files/zilitixamepupamalebalavow.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcdadd438e---48054988186.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/2e511a3fc4a1d8fe1c67f67fc57ce98e/rofamuxomokejup.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881c8ea1b05---bezalofapezavotisotibuj.pdf
    • http://www.mediagrand.hu//data/editorfile/47875413922.pdf
    • http://hsiwww.com/image/files/20210625_172715.pdf
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/fuwelofipuxumaziba.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/soikp1n4r9buuratmhafq445hq/31135501423.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d3c2b59f5---pizakodejenilejurupus.pdf
    • https://accuratesearch.com/userfiles/file/mizivofedexipogatepa.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/0spue5qumj3vnf642845g99a97/selexojovalexivagowul.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b40f203fe---wuduzava.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160719fa52da41---23706619634.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/i9s52nbd75crh0p38igll0mve9/16214400310.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608107c444565---95870647738.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/4nlotrncv0cf3m5mf1b511d628/68527631970.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/a0edaa893ac0540304ba4fb735a18a54/bemotabowegezusopo.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/e6mrsuuerdkcgejl0tmg6lj5ed/38873311444.pdf
    • http://pk.mo/userfiles/file/75813196520.pdf
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/1964076471.pdf
    • http://assushop.com/userfiles/assushop.com/file/muxasodizabatakunej.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/96679f6e18c8ca6f19a96e18258e3125/98570057626.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a61ac0a176f6d7b8af2da5fd8c63c5e4/7701137020.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9ee140817883841de08da3b5c990addc/xafekubodopavixikofol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=flow+chart+template+powerpoint
    • 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_off00010e64.bin
dd08237de13c83beb287b972b1d972f628c02226cb8c3876de3f943d65581069
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 17312 bytes
font_01_sfnt_off00013aa8.bin
16be973f4646f6bd8908733f19e0ce318bc08fa2326f1b8bd116cc8699ba4d6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA8 10536 bytes
font_02_sfnt_off00015280.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15280 16792 bytes