Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c27f7f65849026f…

MALICIOUS

PDF

83.8 KB Created: 2021-10-11 09:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 1da09d43f61e59d76c4b4fc9d05e1b2a SHA-1: 10d271e468a43a9044cc42288480711a58eefacd SHA-256: 3c27f7f65849026fc9f5eb44b49023f9b2f1b2d37c302cc400d748c8a6c1a8f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories. The presence of JavaScript suggests potential for malicious code execution, and the link farm indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/us7emet8ciktd8burcdl376g87/39555050179.pdf In PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/vikowefolazibol.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/pumuditenur.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/15160488411.pdfIn PDF document text
    • http://darstin.com/userfiles/files/20556786647.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c0421820c8849af1980685cd81be5142/tobifupepadetupofiw.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/bugatalagizofinakol.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e05dddc2b6---timubiboxuzopitetage.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/xazinovavojeperebo.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/83279808811.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/981980342cb953ad6fc69d391a707b87/65639960398.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614618504a8ff---57759225028.pdfIn PDF document text
    • http://skupka23.ru/upload/m/44797646782.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/kuvesug.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/54313737339.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/39422574878.pdfIn PDF document text
    • http://taxfreepoint.com/file/kuruveroremesom.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/5463702254.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/13180020585.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/mijibugupidirise.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0a24dd845---1260878221.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/35174482870.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/meradajepajusiwisun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=letter+g+art+projectsPDF 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_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 18704 bytes
SHA-256: e81bdd8f29ff231419d7d3c14ae230c86778fada5862346a8c06a4f0ec0b8440
font_02_sfnt_off00012854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12854 10392 bytes
SHA-256: 9924b059ff9377ef04a1642f55ddacb839a227538e1d3a1ca02ab1e652068d15