Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a47a3dab954e155…

MALICIOUS

PDF

88.7 KB Created: 2021-10-17 15:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0af20e04ff033c46be9b5a78a2315543 SHA-1: acfa58f5fe896156d25ac23473bd6b72508b1765 SHA-256: 3a47a3dab954e155ea093913f0611dac476259c9853a502b6842d597ff30f19b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are likely compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=pogil+muscle+contraction+answers PDF link annotation
    • http://vocal.bpv.su/content/files/files/xenebamawulipisijolav.pdfIn PDF document text
    • http://360global.ca/userfiles/file/35880414493.pdfIn PDF document text
    • https://path.mn/userfiles/files/kokaximulonu.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/faxuxagawadebu.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/sumatasapipetisujiv.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616404838338c---42858985325.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/negulu.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/tatife.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c67979e83e1c0c8dd5a0185a0541db5e/mebawusepiduwujogosifo.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/duwunopiro.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/jetavuwavobat.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/41307144469.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/31052297824.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/fosopilixarogek.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/33767588645.pdfIn PDF document text
    • http://techmechengineers.com/uploads/nidaduroxero.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/32063225013.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/acb159508b5ec1c9a74b9bf48c10e9a7/nuvibuwexefi.pdfIn PDF document text
    • http://midel.me/userfiles/file/vixoruwenuxudusi.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/52836695918.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021101319112444.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/608715779.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_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 10760 bytes
SHA-256: c27010bd03792eb7da7a609fd0782059cdccc3760845c39f65090ae8e5bda4a4
font_01_sfnt_off00010cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 18576 bytes
SHA-256: 6b2ac5fe5953b22e17912a446d8f297592f9af749842b6eab1843da792216c1d
font_02_sfnt_off00013db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1