Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acd8d9b2e5f53a3…

MALICIOUS

PDF

85.9 KB Created: 2021-09-24 03:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8d5048cd1c6da4c21e2110f9b9b4f97 SHA-1: 2b917ebc546be2f97fc9880ce69feccf92290745 SHA-256: 3acd8d9b2e5f53a3491145bdef7fb6f067aecaff597f9e9fb12c57087074526c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple URLs, many of which point to disposable hosting or compromised sites. The heuristics indicate a link farm and a callback phishing lure, suggesting the document is designed to redirect users to malicious content or solicit direct contact. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.fishandcosolicitors.com/uploads/files/gofinawejitojunififalexaf.pdf In PDF document text
    • http://lidaoxc.com/upload/files/nodimamobemikekuku.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/sevojibapi.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/luliromatugulo.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/bopatakiva.pdfIn PDF document text
    • https://opremazabebe.me/userfiles/file/darametaxuta.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/vaxanixikilejevozurejigo.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5b0e34602---46241216609.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/92257477989.pdfIn PDF document text
    • http://trovas.com/userimages/77081895291.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/10431876117.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/88138893030.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/46943650107.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/majokamikenufafebewu.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/labud.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/38810971735.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/74b4d0cddf627fa1d65a4c755560cb3f/12748377299.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/kisixup.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/timafeju.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/85464336295.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ab85d417e---gowonovibumu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f479e2031c---dunow.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/151455347131.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/81396942196.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/4204147568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=total+history+and+civics+class+9+icse+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_off0000e9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 11028 bytes
SHA-256: c5b714f98cd0631e225b0fc4d52a7c36fac9f4a0de6f46cb877451282f5bec77
font_02_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 17768 bytes
SHA-256: 9516056197bc907c071a6144141d3eb2ce655ace4540b7aae7a9f098f54cf2b4

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