Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec424a23d58d70d6…

MALICIOUS

PDF

83.2 KB Created: 2021-08-25 05:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f2d9ca2fecc93f44ae134f5acf21c75 SHA-1: 1776f92a5a6e86ee0c62f343bd495499024c7402 SHA-256: ec424a23d58d70d6de9f0fde6385b8705f07f3c0a6dd2ecaf15fdaadea0b9ef7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution vector, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c3a6a4ed---xerozivo.pdf In PDF document text
    • http://abw10thstreetne.com/uploads/files/15173506757.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e694fdc3---21784940769.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089812adc989---90965401175.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/fefelizifonobilajo.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/kesipulatenofizadirivijuz.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/1jjc25ovqu005sved5i3uftisj/babolufelezuladiwideneb.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/15f730a8ccb2f9e83441bfd284be970a/97820133481.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d3665b50f81---zuvagusamixake.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/sajaxutajezikavoripijugup.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e0c725b7e05eddf299780607dd7c737a/vaxobugupetapilonanonuv.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/kqnm8j169sjg6ik69o50h0si16/notoxufapotemokoboritenat.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0df374322---66095286790.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce3c897b3---51157460120.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4acfec7693---fozidodozemodaw.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dpe13o6d740f6hckjk2s3ldvn5/8182347038.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/zatuxubekanisugulejod.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/murozurineveginazaf.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/39159464475.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/javiwunasivagoxeg.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/disirenamigunujaravis.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a781a40cc12---ronizomedudekul.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/28006461225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=proofreading+sample+test+with+answersPDF link annotation
    • 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_off0000e660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE660 17392 bytes
SHA-256: 3d437b023a1e20b07a2d779ccb23a738b2dea1df78589b78816b315d30560b9c
font_01_sfnt_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 11032 bytes
SHA-256: fb7147320b593c6201083aebab3a0236aee519b097647700ed9fcafd971917fa
font_02_sfnt_off00012ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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