Malicious PDF — malware analysis report

Static analysis result for SHA-256 36aaa84f265f097a…

MALICIOUS

PDF

99.9 KB Created: 2021-09-02 20:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c9bc868a5729de5f372381072c523a4 SHA-1: 102236810c84c130931e403b262f6e9163048542 SHA-256: 36aaa84f265f097aacb34f699c96ca0742a69d1eb024e3feec57b85235daa9c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress installations, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure or a redirector to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/169d0021cf87b250f8064bdeb5a75fcd/38318937962.pdf In PDF document text
    • http://exmar.it/foto_fck/file/88294674864.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609549e9d007e---metepibuvigabinozo.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/nonimazozokesamadedipiper.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/rimulovotulivibat.pdfIn PDF document text
    • https://basisangka.com/contents//files/lirujekibe.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/6dccabfbb4281876e79c2af47bda1877/tibiboruvalobero.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/98740195594.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/14138688213.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/giwofovobivexepoto.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210726015432.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161259973066a3---dafotipefajafazasaf.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/28817390672.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/xozutesiv.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/lajilolukurevoboxur.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/b628485ac92b811bc3f3680b8b0e6c79/7268123180.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/popofagedezemunepape.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/60092104950.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/2lbjsvc1116ah5h52tjkq9vr8m/25379444889.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/4a4620d82191a679776772833d50c949/5481278109.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/48713545583.pdfIn PDF document text
    • http://kalikraft.com/images/file/jalekanelokebe.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4e7db9960b4290038c34a77b24d32570/vazuzodafapotinisi.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/pologunubekikuwulexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=jharkhand+river+map+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
font_00_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 21172 bytes
SHA-256: 1461dbb3d7079116c847accd189230907451e31b8bf42c473d508b267ab09ee1
font_01_sfnt_off00013c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15424 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_03_sfnt_off000169ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169CE 10480 bytes
SHA-256: 4ad74b3af04233421019d9b4c17175bdec7cea5f331ba1c54ccc6166eb27ce41

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