Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14c48123251297c…

MALICIOUS

PDF

71.9 KB Created: 2021-06-20 20:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: bc993b91ed1320dd61f6926779a97e3c SHA-1: 61b3d3790d18224deff0a7bbe209bfe7c7c99a5a SHA-256: b14c48123251297cc334869237171d3c13f6ccd2747950aee472002790b6b8bd
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The document body contains metadata related to 'Evony the king's return hack' and wkhtmltopdf, which may be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9533632fa---goxutiwesizudat.pdf In PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ktppi06hj1mi03pju24psfveo0/bofazosaguvexufemeguget.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c904024e60---kuforusepineroruk.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1fda312dde8613ad7901ce554bd73f74/fumiratojotoduzifojen.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/20043016459.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/e5c14e9c57d42a71d43f11575631d85b/63164943654.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a01fd84f757---36811016666.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/22601796315.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c778252c9b---nabonufex.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/22630787665.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070df2ea7f98---joxazi.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ibo1476ct6kaahgdp3cmnjhu8n/vakoderakamegarusizoxa.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/acbd647703523965ae5566bc0eecd858/18921406311.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afa755b56ab---48053713042.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=evony+the+king%2527s+return+hackPDF 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://scripts.sil.org/OFLIn 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_off0000c3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C4 5248 bytes
SHA-256: 0373e6b2e72247b97eae059c70e6cbefe77b6e54a94bc4c289f1df892c6289b7
font_01_sfnt_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 11232 bytes
SHA-256: 2fda606a3fbb2d244b3d42b3ea8f2dae43a3d2938c1ef1db0fdfe4947ef04e6f
font_02_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 16068 bytes
SHA-256: 2e6efdb6ec6b06881b73571a6dc11127da1b4fc0f11d045bd7c2e12cbfc92ea6