Malicious PDF — malware analysis report

Static analysis result for SHA-256 f500cba575a78339…

MALICIOUS

PDF

88.6 KB Created: 2021-07-02 22:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e533c973234ede0c2772ab2bd73bd0dd SHA-1: a41defeb31dd0700cdb4f069b2ed21619c6184d9 SHA-256: f500cba575a7833930b8c611a009283fa0a5a4f5f8bf129771b45ce9cd8f0eba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links likely serve as a redirection mechanism to deliver malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or leading users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081493b5d3a9---5138049534.pdf In PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/bba851a353665494359534321ae2658a/75281360741.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160870e506164e---nibinujezixamivopemu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37e00dc32---24661929480.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/thqh4nabjo8kps5ehutj6tnrlr/dozakimizixejusawofono.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/seloxukedoxeri.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a167436b---ruxevebugovorobovidam.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085593cd9a4a---kufodevagifevoletugejib.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210504093211842768667.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1624385530675729941.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607200395eede---ralosipepuneviweken.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/646efa05df7d6364b3545f992632b30e/96224910819.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608539eb29218---zozeluguwudu.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210601101114.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/cp360o5phnnea1d9sdpe3c5g72/taregebakofosuwub.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/kipuweno.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0458d059e096e4537a8e45155d3efd9e/43328737482.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/8888616928.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/2e8f8a571331e3643cf203436e610e95/19633644105.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/35036183046.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/noxul.pdfIn PDF document text
    • http://fotossc.pl/_files/file/fewolute.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/miviluxugumurijigevutifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=css+selector+weightPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 10360 bytes
SHA-256: 667c7529f63b21d41ad424baea813b6c6f9be5f662485babed3d8bd2ead26cb5
font_02_sfnt_off0001263a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263A 17360 bytes
SHA-256: 35edb49c8a1c1defaeeb16384bfe2952b20055a57577446e7893cc80e6143940

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