Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc3b8704fbd6176…

MALICIOUS

PDF

86.1 KB Created: 2021-09-07 04:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2755edd1d85400a28a79cbf49ecb0935 SHA-1: ffca783ba90beece4db6abe0c0c2bcec9fc64d24 SHA-256: 9dc3b8704fbd617642f130f8ea4a721eaedfb5dd43df62a07a91df59e3072594
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a secondary payload. The document body is unreadable due to encoding issues, but the presence of a link farm and embedded script suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bca1be61bc13671cd3a4249d4d9f316a/96871565480.pdf In PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/kekoxelase.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/93999340108.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/89121435162.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/36520314251.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071578141cff---45618089658.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c070efe79f3---sedezojakas.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/94649532929.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a683476321a---33417807119.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/58820671877.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160795a2a02f5c---kepipolomoxuxajivivanuraz.pdfIn PDF document text
    • https://hssanesteban.cl/files/dedinitepopisilomalizure.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/vataregolira.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1ccbd0f60---navusonanosit.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b86d372b519---doloze.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/difikutomisamevojefak.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d35845f5c1d04745680f102e32c1a36c/69634920260.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/xugabirunaveburin.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/senidises.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/85431011033.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/soaif1jit2vi28lole8teqq9g4/fitafozuzigeripafa.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebee718632---20699473603.pdfIn PDF document text
    • http://caramelitos.sk/files/76769246973.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/58058537102.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609046ada1c4e---zudusisivapojokelifemana.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a2a9f72a2f92e821982b8445bf16aee/62708505340.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/bikimodaveniwajulaja.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/50219813294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=darrach+procedure+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 18908 bytes
SHA-256: cc8d05fd647ce9919679c36351a3d945271e3cf57232f6c69b4079c7f62d3028
font_01_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 10308 bytes
SHA-256: 52d55daaa0c95d290664d1d153df4439cabf778cdc97106363d55477024e672e
font_02_sfnt_off0001327f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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