Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4e3e64f8d17e9a…

MALICIOUS

PDF

103.1 KB Created: 2021-07-17 19:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1f29e2274997289e4963e20608b5358 SHA-1: abfb5d1eb7573302c80313f0c79bb6c36c567241 SHA-256: ff4e3e64f8d17e9a66c7be4ac09d75907df606238a6fbcdbe0887de0c43dc2bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, a common technique for hosting malicious files or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f837a030d4---kelasedadalusoda.pdf In PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3320e1a9a---5003610791.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/nebamobaxumotisepaxixer.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf2c3e498---novurujunipujuzexusi.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/vofabojopuzoveloduwal.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07d44bac1---nogewoxagijapineza.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/87982684624.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701c863a676---juwafanigewekuworaz.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/lakus.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/gikipenudaxebo.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081bcf2d320a---migubumevuku.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/25540987513.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a5e9cd9c5---88986116021.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a027d96d2dd---10785186552.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ej005ma753prmtb5l7asf0osvb/sinek.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fafa93ba23---fujewirisegowum.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6d8317423---gipexikovotudogat.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c79445ff0---tugotakoxaboluvavexas.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/34276612222.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/22595d13d189e255061dedae61fe91fd/tedazurukifotutuzamunapi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084c209d7b3e---93766136291.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc4523ec9---zasoduzivutemo.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/pofituro.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/49326547e9db40c1a74ad17296524d4a/vupivozoxowufusigal.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051521052373499.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/41d6c1d9763c38486da50d360b0afde7/sibogaluzadum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=linux+bible+10th+edition+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013018.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13018 27724 bytes
SHA-256: 24f850b205d4581dd0a69211feb0b1e3021a0942ccdcda4026f2fa698642c9e3
font_00_sfnt_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 10640 bytes
SHA-256: 1c1593e026c0e4ca8b7292f6bbd75643fcc292c4e9f7e4c56c443645f9b916cd
font_01_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16081 17516 bytes
SHA-256: a018121d0dac5a3ee65d40ee6aff884493aa1d4a51b54da639d7e2902af4f2be

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