Malicious PDF — malware analysis report

Static analysis result for SHA-256 b377cf2eb09fea84…

MALICIOUS

PDF

87.6 KB Created: 2021-06-30 08:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b37049dbde6f46ec2ab57d831017ea04 SHA-1: f46994a9817f712d78eddef0513e115963d7bf31 SHA-256: b377cf2eb09fea8425eba66ce72600b9091347fd06aec264532813ba159e3134
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports this, indicating a lure to download a payload. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://nomylo.ru/uplcv?utm_term=dual+space+play+store+apk
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1af123973a45adafc2a06f781da49883/wuweleloxuk.pdf
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/labuvediben.pdf
    • https://adepotcustom.com/UploadFiles/file/20210528160321161.pdf
    • https://invest.pl/userfiles/file/11851081059.pdf
    • https://numberonerevolution.it/file/kifugaponebeborejanib.pdf
    • https://afayl.com/userfiles/file/fuxexo.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/svau434lehfjtrvsnmvjpd985p/wukijibubevivosez.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8c122af9b8aea589ebe518a0ba3f48dd/7577160428.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/1vv2mmbr5q2jo7bk7jlasgo63f/zediwareb.pdf
    • http://akkoryazilim.com/userfiles/file/lonusafijukobo.pdf
    • https://cambodiadriverservice.com/userfiles/file/mutapefefurodip.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8639c538a---vuxopapowojesos.pdf
    • http://jedwines.com/cmsCart//upload/file/rofotibisikuzakukiwen.pdf
    • https://area5srl.it/file/6018234076.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/af2dbbf28c079e7100efd381d8cb1e36/bapirirazikirelawuxe.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37bba7282a---84147857933.pdf
    • http://btc-ltd.com/upload/file/71710155138.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/lph68l5fs7gmsflam63qpbkl8p/20826003271.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501203541296219.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48fafa10c7---59276770090.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c4493a631---matopunugezo.pdf
    • http://appinaris.net/ckfinder/userfiles/publics/files/mexem.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pvt1rhoa2oag8d59lrh94efme3/30160298505.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b96dc82b52---51852606551.pdf
    • http://ahchala.com/img/file/takubulox.pdf
    • 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_off0000efe6.bin
cd57a270bce7f1e9962f5dd5467580f108563dddd511876b1eb99cf160ab4a34
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 10476 bytes
font_01_sfnt_off00010803.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 16792 bytes
font_02_sfnt_off00012015.bin
1155f8c41fb8717c1df3672ee5453c3778c921a08334bd8732f1ec3cf82f1596
pdf-font-stream PDF embedded font (sfnt) at offset 0x12015 18956 bytes