Malicious PDF — malware analysis report

Static analysis result for SHA-256 9779089f8c348394…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 06:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2251f906842f5f35eb8a6e242aed595f SHA-1: 66391b455c46c68cb78ab9e3c12c3fb29f88d12e SHA-256: 9779089f8c34839441082f1335a1d9c70b005840cf8ddc148cfa19c5579cdf95
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d1caa14a9---3603655838.pdf In PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/12196816276.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/14400094317.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021071600432670554.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/fudodonisatok.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/mejefavigidaliguzilo.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/jk98p8lqskmtat2dhcfmeo3rs0/62140882404.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160940a4d06da2---posuxarajotijebasawal.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/fazakifugidukijijiwexi.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/71695753824.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b79056dbb9---sudedegikikuf.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/kc5qfu3opg1rvdncv1l7v6456v/sorizovugokuninekulag.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/lirexisogemuburutuwonaf.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ldkqfhn3uqd70vtb95cs028k9j/xineridojubebus.pdfIn PDF document text
    • http://htygroup.com/upload/files/zodotomuluvodelipidat.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/wezerumava.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/84757396732.pdfIn PDF document text
    • http://odumakus.com/uploads/files/26077184930.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607169ff79c0a---47077881518.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/oah663q9am7aj2713df31mnodi/79066153266.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e743e7380---jokovokosomanegasidero.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/94532698426.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/tijuvim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=analysis+of+balance+sheet+n+s+toor+pdfPDF 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_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE760 18388 bytes
SHA-256: fe6ee8532b5478c862e14752a9e5dd9b81896b342b8a15f877525829065522a3
font_02_sfnt_off000117a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A0 10952 bytes
SHA-256: 10d8578a9a5ec57772c094f2f65b30ec9fc26d2d1cddf63d6698dc03b0ca8746

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