Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c69e66a57abfbb5…

MALICIOUS

PDF

113.0 KB Created: 2021-07-01 12:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f996ff1c2aad745afd9aab3ebacd74b0 SHA-1: 411e2d1f39d64410004fbd0f049f11d16ea01141 SHA-256: 7c69e66a57abfbb59008b891bbfda6c9d174c3a69f2967ff7059b23083ce46ae
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/3dl27je4oc48pa9b8ef6j3d8bh/kepubudidaxefax.pdf In PDF document text
    • http://uforoi.com/app/webroot/uploads/files/finunavalebagorareluvugat.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/9359108440.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/nuzejanefube.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/fotifimovebobiti.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d582be2ff3---lidapi.pdfIn PDF document text
    • https://x-software.cz/data/file/16728722787.pdfIn PDF document text
    • http://vizcsap.hu/files/file/41783958775.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/e2dfb496d6f3a74b53d7958da3066336/47534156599.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b273ac6f7c1---84008965534.pdfIn PDF document text
    • http://traviet36.com/upload/files/pusuzagapuw.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/lutopijiripu.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/nikobefojidan.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/8f7d83e024935e81b4ef8eb425acdf9d/fudekepijop.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/80899944403.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9dbeeccc4b44cc6f39f2e1f328fa5330/32069403503.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a829158a686---jepomipurodikokab.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/18568184790.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/zaganipuvubepupisil.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/sivarufojawemanot.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/92923645075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=westmoreland+county+pa+register+of+willsPDF 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_off0001555f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555F 11256 bytes
SHA-256: 321df62d0c092c11cf4ed05aaf6765075dc7f77d41cbc3e0d5ed54a4f3275fdf
font_01_sfnt_off00016f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000187b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187B1 17796 bytes
SHA-256: 61320e59004f1dc02336f6b911421e6e111f8c37e845a60ad8a7e165047e36fa

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