Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ae7e618f1f2863…

MALICIOUS

PDF

78.0 KB Created: 2021-07-24 14:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d82caec77f636ec97ab4c85c0172c21b SHA-1: 9c9e745bef3095fd4e0f11a44768c6e6ee13ad7f SHA-256: d4ae7e618f1f2863a5206b6b3740d054d7fb5ae50c8d738a7d0e34a0abf0d468
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to redirect users to potentially malicious content. The primary attack pattern involves luring users through these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7634

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://vucert.vn/uploads/files/85542471148.pdf In PDF document text
    • http://linpus.com/app/webroot/userfiles/files/jemoguxaborosuba.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/nalamasuva.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607625b4c5740---zagemidudukowaxulelaboget.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e45acf10f---70857141884.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/26997054476.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/5f3bcd749c7c89e6d857865a8021527e/2725871721.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/lotofokuvin.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/14872f7e78cbb11aad8bd4d31b4940ac/sazotukumin.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/kufigeveribegigazexof.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/2p5dppb5ntvud2i273no9f76vr/3241285502.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/sozagobuvusitidasop.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db02b50540---wifepibow.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/rotonib.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160806e72057e4---71143562461.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/sevokonerapugumevu.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tnmbrsu85jto5ridpshtp1lbdg/wesefomopawero.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16097856a6be07---66396386749.pdfIn PDF document text
    • http://winso.tw/userfiles/file/97275756484.pdfIn PDF document text
    • https://aashianarealty.com/file/19173016699.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160913e2a59c4b---zugip.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c57fb0e54a3---rijafo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31dde5f722---jovopewajenatuzominon.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160850809043b8---nesunerarikudovidibaj.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a37a7e7264---23903653432.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/12127895185.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/vajilazanijotun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=a+orillas+del+r%C3%ADo+piedra+me+sent%C3%A9+y+llor%C3%A9+audiolibroPDF link annotation
    • 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_off0000c56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56E 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 15900 bytes
SHA-256: c316d07c1985bc934e5cacc55c9234df1293fb2746381608fe0f11ee7dba521a
font_02_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A95 11104 bytes
SHA-256: cd84bc91a81a1ea9342d430c04b5a58e714e32f923255d4ed51d916b71759ba7

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