Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51119626fd0ab19…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 23:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f770552d81c7fb01ab99929643847b38 SHA-1: ecfa0aeccc1b89d79336382992cd5c76ee407254 SHA-256: f51119626fd0ab197cd92cca76773f710b996b4db0f5b7f6cfb8a06e9e908c2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://daejonggyoyc.com/userfiles/file/20210911010223.pdf In PDF document text
    • http://tornyanggrace.com/upload/file/kazoweriwewasidizusivida.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/luziten.pdfIn PDF document text
    • http://synhbio.com/upload/files/68476225776.pdfIn PDF document text
    • http://360global.ca/userfiles/file/91298239183.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/77857534548.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/fedovojowulojotanav.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/41417397576.pdfIn PDF document text
    • http://erimti.com/userfiles/file/jogitakaxaworitudex.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde987b801---3530330373.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/pevibepi.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/buvokibimura.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/judowi.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/13866270211.pdfIn PDF document text
    • http://www.bash.cl/media/file/wasolub.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/dedubepikojosakogovorefe.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf7a48a19---sowofulumufekalex.pdfIn PDF document text
    • http://nprofit.hk/userfiles/zotawisuwu.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/tekasuzabosobozegozino.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/vapanot.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/xulatisemeradonidana.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/rofina.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/fubolefuritilak.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/bowofi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/6p01hurjsmjted8mp1muu53pml/devofatebelovesi.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/jotimekumozotadututusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=raven%27s+progressive+matrices+pdfPDF 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_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 18228 bytes
SHA-256: 164a03faa01f0332ac1bd094dd699532f01edf3a24d668d562d8552470041de4
font_01_sfnt_off00011421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11421 11060 bytes
SHA-256: a439674f645bef7861f8496d6610ce17184221d3b70fc21736e651d8aa816f6e
font_02_sfnt_off00012dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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