Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63664c22723da42…

MALICIOUS

PDF

79.5 KB Created: 2021-07-07 04:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: be0b1287a71da251db6ff037fffbf798 SHA-1: 5eb93df256c88ac03d9730a39d3064a9237313f0 SHA-256: b63664c22723da425011b044a006c7d920518b52701e8a0a2a3dc762fbd725fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, it features a link farm with numerous external URLs, many hosted on compromised or disposable domains, suggesting a phishing or credential harvesting attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://romanakladatelstvi.cz/userfiles/file/barajanomirubaxaboxole.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a7e00486---radazazuwa.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160797a9fcfba7---14259418512.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093de32d2ed5---79181191938.pdfIn PDF document text
    • http://atek-ent.com/upload/file/86710766011.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7db9cb1ebc---76825186031.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/zilefenuwovo.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/sulumegej.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60cb222cd4495.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/74fa1662db36036ca07afc0dd99fe422/viwovovidivi.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210704114612_id0yvd.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16080eaecd8c76---xonovapujujajagomo.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/94668013580.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/23578a60bda7accf3af571fb19b91ef6/46146816514.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4812c7ee---fevofiwa.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8c0924fa0---97137553662.pdfIn PDF document text
    • http://inercial.es/uploads/files/14260509467.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/melakuzunevisunegawuga.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d7d77e0e9---32997554342.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/4322137758.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d31797e6bd1b14ccb5a1288add3d3596/50488471011.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/pijosemipajexaxezos.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/fi0je13aj49dcgmcrmfc5ub9mv/siwotubanewus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pdf+to+autocad+file+converter+onlinePDF 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_off0000d48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48A 10468 bytes
SHA-256: fce1226c5e11791dd6c5a1d045b86c657a7324ffea4173c1043255d8498abe3a
font_01_sfnt_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 16740 bytes
SHA-256: 0d98059013074ed6c9a88eca551e9d7751699fb5119a515b868e8918b5041151
font_02_sfnt_off00011857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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