Malicious PDF — malware analysis report

Static analysis result for SHA-256 138a79c468783926…

MALICIOUS

PDF

80.0 KB Created: 2021-09-21 07:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8198f13a1a49db5c341de23d4522b52a SHA-1: a6ed38116ec8bf43c6fd079ded854c11022968bb SHA-256: 138a79c468783926fd868422bf7d53c5929545cd7d2221e0e0bc7765a56f5c88
244 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a malicious intent to distribute further payloads or phish users. The heuristics indicate a browser installation lure combined with an advance-fee scam, and ClamAV detected it as a phishing Trojan. The embedded JavaScript is likely used to exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://homeopathyhongkong.org/files/xamiwisopisolevajaj.pdf
    • http://abwingsjanaf.com/uploads/files/8476410867.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/rezosola.pdf
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/82091855695.pdf
    • http://good163.cn/Uploadfiles/files/82305765201.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613619936291a---nuwodukef.pdf
    • http://an-professional.ru/img/files/file/gapibujovumomejivamedo.pdf
    • http://dges.in/userfiles/file/zinotudigo.pdf
    • http://skisun.it/userfiles/files/40151603716.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb64719f49---47598948776.pdf
    • http://potya.com/49486328024.pdf
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/bodevoluverekat.pdf
    • http://on-video.com/movies/movie_data/file/netivimivosuloruda.pdf
    • https://areopag.ru/sites/default/files/uploads/gizur.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137cbf6369bb---47034047295.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/06b6c19f43e453dde12155fc12101de0/28872800614.pdf
    • https://www.abandassociates.com/ckfinder/userfiles/files/17323058715.pdf
    • https://bikidi.com/UpFiles/WebEditorFiles/file/rixekasu.pdf
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/zidabexu.pdf
    • http://thenikharvconsultancy.com/userfiles/file/39040820898.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613690b88627c---53583162244.pdf
    • http://sgd42.ru/userfiles/file/58297895501.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/f9bab101f4e2f5b6d6cd072870f35110/somokabokob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=chrome+81+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d534.bin
deb74b99caf19f06940d8252f13f3838649aedd4f70d6545f069595e1b2f7a96
pdf-font-stream PDF embedded font (sfnt) at offset 0xD534 17536 bytes
font_01_sfnt_off000102f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 16792 bytes
font_02_sfnt_off00011b08.bin
fe2785863eb14fe4b641c2cadd40ec491d21eee8379c6589941960738853097d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 10492 bytes