Malicious PDF — malware analysis report

Static analysis result for SHA-256 923c69ee6e0ceb77…

MALICIOUS

PDF

72.5 KB Created: 2021-09-01 09:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25a162879c76f3893f2a2fd1a517ab27 SHA-1: f9d75a9e2f58f229a3fd371d063b4e32d50cb24e SHA-256: 923c69ee6e0ceb7793885f8a9dc6927cf435f8f26b027e4449faaf9c02d563d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the presence of multiple PDF link farm heuristics indicates a deliberate effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=negative+words+that+start+with+z PDF link annotation
    • http://maraulsan.com/ckfinder/userfiles/files/bobip.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/v9qnnegd0drqsg4rb0691rjom0/padojotigesekaz.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210726011349.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0b1d3d6ad---buvawomopalanenukax.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/sekekixumubekotozigawude.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/13896a0c5d8d1defd89a98cb001f02d6/ririsokatuv.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/78290461106.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/lsgcb9i8dm5v40orsb8bkoi716/75675864736.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/37753601145.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/foruvixar.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021061520572173499.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/aj7vp1fs9s1qrbmju6rt19p0jq/nadekewomuduv.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077d046aa09b---16058913160.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/piredofibazukov.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/38252130879.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07036c1666---26543225590.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e86f4e1a2---93674600147.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/58ba6a5e93700100695141b32cb8ca3b/kosilafosixokosavanor.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/46389565428.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d29df1c6004---gogolebana.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/tegigazulilinuvetifava.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/em3ojes83vkcb817e2bbvbmiqm/likaxop.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/tneuga55i1brj8ips7e9pakpbd/gasoluxoni.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/2067496974.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/dufovewa.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_off0000bd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7A 10568 bytes
SHA-256: 3e9f51cb9f4cce782b82c1ccce74d2edf1e32e0b27cd4f6a2645f24fa4d806e4
font_01_sfnt_off0000d5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A0 15244 bytes
SHA-256: db93732693ec59e67548f13a8ec520219a3e6dc441ee165f8cb3f342784d6efd
font_02_sfnt_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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