Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ad51547784e251…

MALICIOUS

PDF

87.3 KB Created: 2021-09-03 20:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 427fc9484253553c31099b77ecd2d80f SHA-1: f78aae5a8880263ed53918e3dd1da5c4ce255e81 SHA-256: b5ad51547784e251377814cc2ca5e3349d1cbd0e0dc9a51e3ababfd253f4ab68
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. These links likely serve as a lure to download a secondary payload, aligning with a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/4h40m5kitvgtfr6fd0vudst24r/gesujig.pdf In PDF document text
    • http://kaizousha.com/js/upload/files/36014508343.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/wumifigidiros.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/gobutapix.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/40763640417.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/49753575478.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b871b66d50f---fijixoxekupobalurixenula.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/2vdljn5819qkc0cjmic34k2so6/29777984796.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fb295a84a43f6a8a9c8b4bf2bcef6ca6/79304331016.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/24599377234.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/38712040342.pdfIn PDF document text
    • https://aspirans.com/files/file/30382851368.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/jozugin.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/18628624882.pdfIn PDF document text
    • https://sambelteri.com/contents//files/xetadafiwowibame.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4ce7923b9---89082609222.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/25974055075.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160970b1966040---loxalogaxexenuluz.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/04f4d60641367589a95e4b52f4dd5845/redobilimejenexuxa.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/e767a4573b762aec127b2b1cef3ffb13/82549740919.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3f57edb19---50633236466.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/lugawexanagawotinogaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=worksheet+past+simple+irregular+verbs+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_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 19300 bytes
SHA-256: 4b26d1dbf079b6bee2252864e0a28458830da69c62fd013076942688037ae79a
font_01_sfnt_off00011d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13549 11232 bytes
SHA-256: b86714e74ec6f13aed4a710ff769915d4cae97825c70e30ae9910f10d6091322

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