Malicious PDF — malware analysis report

Static analysis result for SHA-256 01444dfa67ba5884…

MALICIOUS

PDF

87.0 KB Created: 2021-07-06 14:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 89382a9b2f8c69c132d0c3bb06ebe369 SHA-1: 0bcc4ae2b44feadc5a784376fe02c613f7508d1a SHA-256: 01444dfa67ba588427af63fdaf25e5d272429e383be5108e5d834b851977e1bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting domains, which are likely used to distribute phishing content or further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of disposable hosting and redirectors, reinforcing the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bestofbucerias.com/upload/file/mokasifinigijesaruduzid.pdf In PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/310b629ec22fabf1c40bcbf126881d86/91382368697.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc0cef4464b69e7d8423ee9daf582192/pagegafejilagobu.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/kavelanikorabibe.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d6338e768---mekotigebixurowisewugoje.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/51329118726.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccba43771d3---tenilapefopaf.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/22507664292.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609cba2dabc84---38227183665.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/39fa71052aff0bbb1da0ff9d6747f0f5/fevarojovenama.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2b635d22c---74014982668.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/89678035878.pdfIn PDF document text
    • https://termofriz.rs//files/daruginadijumozusabo.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a353a259c2f---letaxipete.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/30516625387.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/goxujosogijarivemivoripag.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06a956679---59651726929.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1288c610d---dotepanusokekimafuga.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tus8o4slo1jf4rao69ichfdd96/89181511601.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/7158436344.pdfIn PDF document text
    • https://eventaipei.com/upload/files/kofipapenutofepat.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/56008687474.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/7fd4ppe6u0j8mfkif0mmu0b8f8/49975932841.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087762409e01---dobefobiwexapuvifaga.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/lme6hris9v1a9mtmutobdh1tsh/netujopabogonopegar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=small+scale+business+plan+samplePDF 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_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 16876 bytes
SHA-256: 476a7e8173d28d08efedebe6eabacc900cc42a3ec4a3a8c19d954b5fcff991ff
font_02_sfnt_off00013712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13712 10532 bytes
SHA-256: 83528c7ca309e5acf9e32456d475dd3173de956ec8944156a4db52007bff968c