Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbf4c01f3cd5f34…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 04:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50e52cade194906d66f23440c925a7ba SHA-1: edacecbf38090402b241845c71d3cd85d9774673 SHA-256: 7cbf4c01f3cd5f34ae2e2cf13e25e23e1521c6d0454b06dc084eff3ecdb2823d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the 'Urgency / deadline lure' heuristic further support this, as these are common tactics to trick users into clicking malicious links. No scripts were extracted, but the overall structure and URL findings point to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bece8116948---wivetenuwamojagusu.pdf In PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/difexasafoja.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/wunigabibudajulomi.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/nitaxaf.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7ltgko1i9ndm54h4jnecpg2ffv/1915416429.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8024a44e24---zuzafomugoxinefozoj.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/wasamurisuwo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33e9d9cecd---tevabafavexinekol.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3aeea2171---48550364252.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeb37ee2dd---99033232361.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cf107f07ea1---kofisiwe.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/78222661974.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/raratajakawajogifexaraz.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/71926241535.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ffc05d13aed---kizipokivuwadigegudijite.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/jinuzevuvowanifuruze.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/45776072308.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/76512903204.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/63370346380.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f89a2f810---dunusiw.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/58724958653.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858e974f58c---zeregu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d7c80d3e4701d4e46957da42522def96/40235983914.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/da9432e549f6bbe2b4f45e9e34ec5548/sekuxusonumegimutikame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=show+me+tell+me+questions+and+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 10920 bytes
SHA-256: b8a570deffaf84e757f0d1a21be533025bea1df35c7219b038bc7ac485b8955c
font_01_sfnt_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 17696 bytes
SHA-256: 3524329547c4f36e49c1a25a6cbfd9f34c237d72d6eb7f901fc0249780f4b3bc
font_02_sfnt_off00012667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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