Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f495a1c71f22150…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 20:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c132f92798632b49f29b3db87d3fd318 SHA-1: 9cb147050b32a245052acc4a9549e106ebd52d9a SHA-256: 3f495a1c71f22150e1f263ccf1366f051b4e6dcc9463d77df87877cc4b4a0fdb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicative of a link farm used for phishing or malware distribution. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=how+does+a+eukaryotic+cell+differ+from+a+prokaryotic+cell PDF link annotation
    • http://camelliafb.com/uploads/files/202109082147239381.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/wewovakimupinavofezeziteg.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/11957489987.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/7844956993.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/zolinexovowemoviputusewi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a2d224ec---49392567056.pdfIn PDF document text
    • http://glttek.com/userfiles/file/tofupilaguvuluzuxagununas.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/52619937105.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/67377458238.pdfIn PDF document text
    • http://langyupharm.com/upload/files/56303336358.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631301621.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/21788369908.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/guwokulibesuzifala.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/valemasixulaxanilim.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136e1b313499---97822447929.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/sorutobevudukazujitajok.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/92077989496.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb231d6d12---wavabibexe.pdfIn PDF document text
    • https://coluer.ir/documents/file/40737356821.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/60616902958.pdfIn PDF document text
    • http://banquat.com/userfiles/files/totafanesilab.pdfIn PDF document text
    • https://sitarasign.ir/data/file/rirup.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/dovajivusofejazeje.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302410b0748---jedigenozepudivi.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_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 11060 bytes
SHA-256: 8ceb55fec77d23874a2d90712bd0f88fe1cb2650956d9ad9e423638a809cbe86
font_02_sfnt_off00010831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 17664 bytes
SHA-256: 46863609cea7541e67bb728701be0016f8450c2d0a60e3737bd3eab3294334c7

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