Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfa6fb67a56f997…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 21:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c68ecd6d6c8be4780aa88d66a09c6398 SHA-1: c05156904a016f0a94eda7196c6b9335cbf80916 SHA-256: abfa6fb67a56f99726707d40a368bb2a0139ef77078ff590b80e9ea350e6b6a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gocchame.vn/app/webroot/img/uploads/files/84281399812.pdf In PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e92f95004c8b7ea395fafc6baf3060a5/buged.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/muronimij.pdfIn PDF document text
    • http://k1a.ru/images/files/file/fumusejafufatod.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144ba6910216---ledinavawaku.pdfIn PDF document text
    • https://clickbox.ro/images/file/gegubobamaxopo.pdfIn PDF document text
    • https://penzion-palice.cz/content/31354605594.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/lodug.pdfIn PDF document text
    • http://zzquansu.cn/d/files/7154946600.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e103185a4af911d6dc49b162d1b3fedf/57423806734.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d98a47a4d79eef062a9f3849521cec4c/73027540606.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/ximida.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/25126663239.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/gezis.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/vibewijurakoraruwudo.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/bater.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/69051365462.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/nabariwumilutiwefosa.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/bidifam.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/nonuzizaxipegi.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/bd1965a09303d7f96cdcbd9705c73973/gonidevejegibubagawebo.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/begibosovijeregulelet.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/93072750587.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/semevefosukiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=auto+call+answer+apkPDF link annotation
    • https://mediaget.com/userfiles/files/fumevalopedizoragi.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_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 10536 bytes
SHA-256: ff438cc0facababa930ca10c58650a90abe5f07991a4bd56abf0e43ff670efce
font_01_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 17548 bytes
SHA-256: 2d6e8961e6e8d3bcb48edfbb7c7318ca32ac2da1f4927bc523c25eda8e0a2947
font_02_sfnt_off00012381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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