Malicious PDF — malware analysis report

Static analysis result for SHA-256 728f7d7715db1ff9…

MALICIOUS

PDF

71.4 KB Created: 2021-07-13 02:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d5052c189d23bf36f8370bf422e06c7 SHA-1: 70895c2bef091c9dbddacc22b1e4af8440c75ccf SHA-256: 728f7d7715db1ff9afd7624d3df65925f3f47eb7d12cf3f8bdcce0d66ad7921d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the presence of numerous links to potentially compromised hosting services is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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
  • 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://store-connector.com/_upload_bilder/_filemanager/file/volapazukulizitufejiliv.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/fnqifv5988oa28ibpt27757fm9/14842681712.pdf
    • http://avsa.org/sites/default/files/images/files/sexixidik.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/16a1739057c09aacf289f98c5c738553/zosizejatipaserodaxo.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f25c4e973df3bcdee723a51c237539d2/bixoninunaminig.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/v6c60i18dnm7556veg7ilt1ljv/50824712040.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c660c155b9---91097572347.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607beeceee267---wobiwagigupaborajozi.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abcf500e9e---26218433800.pdf
    • https://angkorphotographyguide.com/userfiles/file/10562766725.pdf
    • https://sportsht.com/userfiles/file/texidubugazonofomitag.pdf
    • https://ahreco.com/uploads/news_file/71657803650.pdf
    • http://aucoindeshalles.com/menu/file/77171499810.pdf
    • http://studiophotosfashion.it/userfiles/files/novuvuwopetowilowodu.pdf
    • http://www.petercar0937494634.com/upload/img/files/32771969552.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f3296d749172db96b671e01c323c5a48/nujatobonuzu.pdf
    • http://sun-tes.ru/files/file/6373744120.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/jgug5nqaa059q7acsllldfm4kp/lilisevulo.pdf
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/39414655767.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/dawumum.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c6c4e38bd---fagaxuxewe.pdf
    • https://mszukam.pl/dat//file/xujimagegavonorixalawof.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/r922l26g1lpes2k2ru51vtgder/kajovigomonasi.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/33974929697.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c1cf96261---97131913365.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/0d714f3b5f1435e8d07508bb79a1610c/dufiwexekedofuwenizemeluv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=nursing+interventions+for+auditory+hallucinations
    • 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_off0000b747.bin
143e99e168e37bce4cc449a31ce023e537adb66b4356ad7260d68e08c3ceba99
pdf-font-stream PDF embedded font (sfnt) at offset 0xB747 15240 bytes
font_01_sfnt_off0000de42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 16792 bytes
font_02_sfnt_off0000f659.bin
e6aeb1b5c67048feceb001fa6086cc0547fae6f14651cf9012bc7f2d717d3b6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 11012 bytes