Malicious PDF — malware analysis report

Static analysis result for SHA-256 250928ca31065585…

MALICIOUS

PDF

102.3 KB Created: 2021-08-03 10:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50e8e86606727f4facd2e845360be239 SHA-1: 58dd7205262fb704be6a05e29ece50279d96f7fa SHA-256: 250928ca31065585183038f3c7f5f642b7ecc7621d782f949d34cdebc062a1a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The ML classifier and ClamAV both strongly indicate this PDF is malicious. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it's used for phishing or distributing further malware. The presence of embedded JavaScript, though not fully analyzed here, likely contributes to the malicious functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://baocaosudanang24h.com/uploads/image/files/bewalomipagenuwa.pdf In PDF document text
    • http://indago-rovigo.it/userfiles/files/86037045050.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160876211924c2---jobigukalajexakenudasa.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/vesubemiviteridezuwi.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/85460505807.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/3211bc257f3b54cdb0f04fbcd81a2d21/vexogaxu.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a8701b2b---56243006187.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda9bbeb3cf---zotebufanezikarufo.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210723_32AD8E2863FA9068.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/1832096003.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/jitugerudupumom.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/sonerujiralalifemavofo.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/9c20c2cb73ee1f00fea781f35a218c1b/pofifilawef.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2eba44e4358d754e744fcf638ef12d27/44599585418.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/19218950312.pdfIn PDF document text
    • http://cartopack.com/Images/file/72134574572.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/13653653431.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/k3uq0ml2eejigvfv43qpn2opfc/2483900798.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/23289241104.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/vafipoxaxip.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d105a5cb3---joxubaratevubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=social+media+marketing+bangla+books+pdf+downloadPDF 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_off000126f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F4 11356 bytes
SHA-256: 9f58de86d4aeae7be4be1ae4023c80665049adaf59d23a66299077890923fad1
font_01_sfnt_off00014140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14140 18136 bytes
SHA-256: f6e038a27906279de8e0776c9220cf29220c27bd8a0e5784a4f1a901137b7ac9
font_02_sfnt_off0001712f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1712F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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