Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff535d80f893b221…

MALICIOUS

PDF

78.1 KB Created: 2021-07-13 21:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: b18cb07a3bb145e612aa4a4e4bbb264e SHA-1: ca68512f16270e5940f09bcbac536521749197dc SHA-256: ff535d80f893b221711f7eca39faba14a21167469d60c366951cd789d5bc6265
124 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2516

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 https://huntic.ru/uplcv?utm_term=the+color+purple+ar+test+answers PDF link annotation
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/69fb0116e6c4244b5a19788a97af10aa/83938038221.pdfIn PDF document text
    • https://ddms.tw/upload/ckfinder_temp/files/20210629090959.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea33fe4b56---6506983854.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/89109b6231d10553af28d5e5eec902aa/tebiwukawidegixupobirope.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/3d6209b3540f01100f19738fc4b97db0/29806893854.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/41bff4f8fc04c4e2ecb70a459e87ebda/poruxazomoribaveji.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/jeperenabelaro.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/65102542663.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/e1fcec6d960063cd0c65e259627ec48e/bebezunonaje.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/d6bc4d1809f873f91ec8b53190144efb/xitomaxavonepax.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bka2c1dd8masujg0o9tk8qcbm7/fotozubixesetolewa.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///doniwejigedewevoworofewe.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160812d92a1d4f---zotewadilalomu.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/92990326320.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/kutunikirato.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/55927707663.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985b72701eb---sinubiwufavelorenuno.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2ab0f73cef203b0a2014b9142b9f920d/wujabed.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54840e864---80759902243.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/forerumuvomolijovij.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa709fbb9---juwenilelabewuwuxodi.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/91832261147.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6laiprv0023r17r5ihtf2rjtbb/86409818669.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160911b4077afe---xavaronaku.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/vakogerevuwabipajafu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f121e7595d---91924050899.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/tosomuda.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/41594717689.pdfIn PDF document text
    • 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_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 16368 bytes
SHA-256: 3fd97ad492992e5f285a8ced78c00820170ede8bd6839167352abc437e926855
font_01_sfnt_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1