Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3d48f4c1a3fa03…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 20:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8efbdf7946cc7a2cdf7c8523a58ee825 SHA-1: 50b0bd87f5d0fe1f0a945c47dfdb53854f350317 SHA-256: 2b3d48f4c1a3fa0304149ec06f7b8073a57d628d6b0d478bef9975ee07aab026
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to compromised CMS upload storage, suggesting it's part of a larger phishing infrastructure. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing operations. No scripts were extracted, but the presence of embedded URLs and the overall structure point to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c906a149ab---60589316173.pdf In PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jipimazepepe.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/rarunurabu.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/92793941797.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00f3c9b286---31766183775.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/11716037779.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/rewulexexasubemixisewulu.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/79794460096.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/dimegipanoxuwazev.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/zixovikis.pdfIn PDF document text
    • http://fedoro.ru/upload/file/40080851282.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1802ca2673---nonodoveju.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/9774a9b256070668855c8c5fb0b510a3/volikolasoxin.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/oltcpgr2tfo5p7gt8mdfg3b9q6/93604661898.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/wefeb.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076fce817654---rinijerolurumax.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/subijomimapipetopininiri.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/37790486475.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/oq8c1iou245u583bp50thaat11/40106714377.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/73187386402.pdfIn PDF document text
    • http://ssp.by/var/upload/59228643222.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/251157279504.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7286db24---ditusutolakazufep.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/bepitutasewopezezigekop.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/zosamuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=zonedirector+3000+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_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 10492 bytes
SHA-256: 68911d9f057c7f4208cc80cf3e7db4cb148023da3d0e7aef65ba9a3ba93d41ec
font_01_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 17480 bytes
SHA-256: eff18908033bed2ff35f75c428f58cb23ff016ef48c4115506cc32beb0873b31

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