Malicious PDF — malware analysis report

Static analysis result for SHA-256 914ddaa3a0f5553b…

MALICIOUS

PDF

94.4 KB Created: 2021-08-19 04:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 837dde18ab0050362fe0335223511cae SHA-1: 04098e4bc1a9c542e16c38a2444b48046272596b SHA-256: 914ddaa3a0f5553bd94136bf9fc134df2fdbe589329ecd25b7035268b39bec35
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress installations and disposable hosting domains, indicating a link farm designed to lure users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. The primary goal appears to be directing users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=how+do+you+transfer+whatsapp+from+android+to+iphone PDF link annotation
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/6ee70e4488481d3c3ecc76d4040886fb/52808139643.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/zujoma.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/542f16aebc0b77b6670250be78fb52d9/89682299062.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/9hmpe2rpfjash4em1e2fa9n4u1/58148265677.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/22f7395b12f5ca1430152bb447a7fef4/kelozisilukoleve.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/e29446f8e09d396579977f5c7561495a/89003650547.pdfIn PDF document text
    • https://banghenails.com/upload/file/vakizexaxagifiwunibekafab.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb4b3a465e---guwesoxalor.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/56959059843.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1251dc537---5549662494.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073102622d2f---9778808358.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cf275f01c---todefikikoso.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ndki3f11of5qe7at72tc4ntv8n/jekululuf.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd9bd32aa---kavugazazopomazinu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/d7iipguat68gqdj467p6is01o6/99039119207.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/pimozupimukitekudajef.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/79fce69e95b657efcad6438706f604ff/silawewaxezos.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/39513685328.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/11787563427.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16087f4ecbffdf---vomajalig.pdfIn PDF document text
    • https://egca.fr/userfiles/file/liguwoxulogi.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/83882309914.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/29968092818.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/62238532217.pdfIn PDF document text
    • https://dm288.rs/slicice/file/96265314291.pdfIn PDF document text
    • 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_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 11008 bytes
SHA-256: ae017b0025873d5fc320fa143c6a5f86ba87c47fd0275e25f7eb59df5bed0fe0
font_01_sfnt_off00012326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B38 17568 bytes
SHA-256: 27eb014f0cb843d7c1c147a8b9d474f0ea6e53ab48fcf5e60f711cb979d1c43a

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