Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b681b5a403c2b9…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 21:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6549a5f2a10a0b8c11fd9eece1a2e073 SHA-1: 46d5461cf6bcf22458659a2d3da2ee6711d7d2a0 SHA-256: 06b681b5a403c2b97310f3beae522a941d5bf95dbd94015b73d1838b420688b8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern. No scripts were extracted, but the document's structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://synerhu.ru/uplcv?utm_term=office+mail+365 PDF link annotation
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/1518c35491afe759bac2298ddcff022b/68388473902.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/176aaff82290f2ce7a0da78df35cba98/ladawajabebajozuz.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/nagitisupa.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c94dc3ab6bc---27688547822.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/293i1haea7qj9jtsiijrn1t9hc/boxarezukejitut.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/mowotajaguda.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/647f55c048ab0fdf3cdba3561cf75d43/nunixasudutimodukoxizolex.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/69995538460.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/68745990948.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/4f462d5301b834e41fa9d8ddc477075b/76808761055.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/kuvinijetutokinun.pdfIn PDF document text
    • http://imaginove.eu/data/Files/nopalizelafixofi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c682a550314---xinekig.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/71284300396.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d415b0bb3bbc9dda09dfad6bd9f135ce/50724562275.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/lalixokuxolabu.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7c09cc866bae0e5904e0c38f14c0dd8f/direfalukofazodijukikaxat.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/73821079722.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4391306f9a---xewenavuralugupej.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/zovilunivabazenujov.pdfIn PDF document text
    • http://citranco.com/users/files/wozanewuguket.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/51321246036.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/ginedot.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/pewebijar.pdfIn PDF document text
    • http://normel.org/files/upload/file/vijudozaf.pdfIn PDF document text
    • 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_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 18348 bytes
SHA-256: 856018ac3e63cd7e1ddd343fe6fdb461e8407c6eb6a09dd5fd48ef8c8cfe8e11
font_01_sfnt_off0001167e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167E 10404 bytes
SHA-256: 6a8b529d1961b21deb9b721affc45a4c651b7d5d849099af18ec02607cda5195
font_02_sfnt_off00012e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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