Malicious PDF — malware analysis report

Static analysis result for SHA-256 55edf3661461fa15…

MALICIOUS

PDF

88.6 KB Created: 2021-07-18 05:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 57bb6096aa0c7cd0e7430d9c2241ef40 SHA-1: cee2f6400f74ae25b33b61231cb30ec461f07102 SHA-256: 55edf3661461fa15967f59a2347ea09c7c48ab83fa9039774662b79ff6d4c17b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://telmeed.com/web/ckfinder/userfiles/files/riweribamamasemoguri.pdf In PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87085a44b---tafan.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/28034499.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc813da924---9696337867.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c9e27a525---62390117205.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/vixujixufu.pdfIn PDF document text
    • https://bnovum.hu/downloads/zukujofulexaj.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/62017636837.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/44999517098.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/fidobakete.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/melelutuxunovujatigipilox.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/36bd4e6cfbda8e1dd97b41b7881709a5/rotewaniwona.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/balezawezij.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160982b505d20f---bogekofipovi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c690a70e4ee---47154839758.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/55440185396.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/movojopafemetew.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vejaifocivueqatvehn6iso8m5/19607992071.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784bd66994e---detutaj.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/73336739317.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c8558d882bd4d566c84e628516b9481b/tovoludamamesipivox.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5d66b965eaffadf019368e7c038e2498/11718430944.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c950da640b---lapirejupolumazadurexowut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=watch+call+me+by+your+name+full+movie+online+with+english+subtitlesPDF 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_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 11284 bytes
SHA-256: e66a7d6cb34afcaa8a324c594d83b07806cc292ddfda3d994bc17cd8f63c8b4c
font_02_sfnt_off000124e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E1 17432 bytes
SHA-256: 8e1753d16425368c1c3516c3841cfcd313c138d0b0eb196611026420daa9d3cb

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