Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1be742f6088a8d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 20:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68bc2ab6a5b2d350f16e942773ec4a7f SHA-1: bed09bbc921cc5bfa25086eee6d3f1a122848563 SHA-256: cf1be742f6088a8d38db0711cd216fedb4e6ad2284b830b90a294ad57b9e4c16
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=learn+java+in+one+day+pdf PDF link annotation
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/k7b82a7ef59ailmme4ged3fi14/45317469083.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/junabexefesozisebeve.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/nevawawamowivejigir.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/11980065491.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090720030594.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/52897066127.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eb667f30b---56508215695.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/58771443097.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/sanonogatuzuseguzar.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/65862006425.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/86442792536.pdfIn PDF document text
    • http://napiarsaigh.com/images/80779870440.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/bebeme.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/24591423016.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/74292863916.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/lijakevidimutabod.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/ropusariwime.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/96003446559.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/32996075963.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/kozumimesusoliz.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7bc1a6096---23170633562.pdfIn PDF document text
    • https://masukpt2.com/contents/files/23616464003.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/0cf783f7b167d1d3f3408b3d27c8e054/90203641010.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/62343492616.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/jusulokarodaxezujona.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_off0000e38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 17240 bytes
SHA-256: 303af9bb1a82bb7aec32e638a3c2127d8f4137667e8005b215ea7f3bc68d0f0b
font_01_sfnt_off00010ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12809 10444 bytes
SHA-256: 142a034886ba809438c0f772c88ed8a4fac7a9e0a22ce090c94b3ea9f5527203

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