Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be7544b7888e7a1…

MALICIOUS

PDF

92.2 KB Created: 2021-07-26 11:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ac606199693273b36fc63a8ec2e9f08 SHA-1: c80f84d17b156fce07950333a9acbd52a240165a SHA-256: 0be7544b7888e7a19ae4cb23984ce4de8ea581156c1288d4ea103a1537e34a42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the 'formcraft' plugin for file uploads. This suggests a tactic of hosting malicious content on seemingly legitimate but compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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 https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16095c45ce7376---bikemafobomavosopulo.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1a329269c---ninajazokevejok.pdf
    • https://aksukartela.com/images_upload/files/71936430508.pdf
    • http://aaykpn.com/uploads/editor/files/sujenob.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/dus7ftkojtv3t2nellqji1lg1f/5553954967.pdf
    • http://damoorefamilyreunion.com/clients/7/71/71c8bb141a0941b69292984b9770a174/File/20418672461.pdf
    • http://standdominica.org/files/files/davizibinabixokixonadagad.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/05e92f3acbac998382164f1cbc10258f/wejevusagugaxilazoxek.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/c24ea034ddfd70c670539ea3fea556bf/somimerulitosutu.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a69eadea781---12840498386.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160964f4fac23d---71466172488.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748fd31009e---94919242546.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20ef2e2733---6805546452.pdf
    • http://scbczy.cn/up_files/file/20210618_030551.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609722dd9f80e---berod.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c58d67dfb6a---83096156279.pdf
    • http://magnumprint.ru/upload/files/nevurigivobomuxi.pdf
    • http://miroslaws.com/ckfinder/userfiles/files/zipibisuzeza.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/503a8ab2e66df5c43b63eeee2dbb64d6/nezorudivojuzalatisusuri.pdf
    • http://consade.com/userfiles/file/kupasekokegojuveloderu.pdf
    • http://eurogeographyjournal.eu/admin/fckfiles/file/96075782398.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c8b7ba3f---zivuzipizow.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d822c640e86927bb13e7dc13871a16de/5755962933.pdf
    • https://hogies.com/includes/template/uploads/file/danimogofujopizoku.pdf
    • http://bluecars.pl/userfiles/file/9478126735.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/50912331485.pdf
    • http://sobsai.com/ckfinder/userfiles/files/26699197683.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sentido+literal+y+figurado+ejemplos+en+poemas
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c6.bin
4e49383f32242e013116d2359b6f8048476622303f96e3a476e3cc811c1e0fb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 11260 bytes
font_01_sfnt_off000112fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112FC 16792 bytes
font_02_sfnt_off00012b09.bin
5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B09 2064 bytes
font_03_sfnt_off00013444.bin
55c4a3d5aabf386082edb27f83ffe77dee9579b2b78a45ca2894e573fef142f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13444 17380 bytes