Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c14b69e7eca78f2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 10:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57dc0f89e01e81ca0f9dd8553f2c01ac SHA-1: 25f4301f9c061913f869a5605d617deb9ef0d7e1 SHA-256: 6c14b69e7eca78f26dbb58d57db85545b2f905d78e98c6aa3756a1076d24a17a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=why+iphone+is+worse+than+android PDF link annotation
    • https://cplastik.com/data/cms/file/25679116653.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/fixozawofurenokudaba.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/27443186588.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/13261312171.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/kedafiwekevu.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/69047455237.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/92234042841.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140372f49d5f---83341923326.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hqpr486nh8crm9rqes8163jqg6/sufarupemu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/81a7658ecbe8bb7976c575d3915f050d/84785460776.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/93701599448.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/20305858586.pdfIn PDF document text
    • https://ms2oke.com/contents/files/44895892042.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/29213438105.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140ddc6d0a1e---rodeluvevela.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/giguvilakakazajezesor.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/20527800041.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/13487793774.pdfIn PDF document text
    • https://hojoairport.com/images/file/zagilelimiji.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/ruxaxuxida.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f214e20e64---tofav.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/waxaxodezi.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/89522323704.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/kuvinagosujemame.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/dapufarofopu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/47e7ee4a5abb46a2d372383c8229c88f/wasimola.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_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 10636 bytes
SHA-256: f87064680c4208081d8618ad81ee8f15add312efcdbe54f98528fc603348d494
font_01_sfnt_off0000f504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 17192 bytes
SHA-256: 01339c3ec6429f2bd2141ad0b388191f9114922cf50b515a8c311473ba60a567

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