Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a349d602984694…

MALICIOUS

PDF

87.2 KB Created: 2021-09-10 01:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d174c6dce1ee02092ceabe72aa781a19 SHA-1: 51ab5efe07dcffe17a952108c14342a03e70d43a SHA-256: f0a349d6029846944171102b137e529f518fa8a509c6bcb3c089b4fff24cfa8c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing lure. It contains numerous links to potentially compromised or disposable hosting sites, suggesting an attempt to host malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to trick users into initiating contact, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://krisoc.ru/uplcv?utm_term=how+to+remove+chrome+app+from+phone PDF link annotation
    • http://linuxnewyork.com/draft/media/85491981291.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135537f37c70---pamojesemabuwola.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/97403047522.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/25379573035.pdfIn PDF document text
    • http://chp-travel.ir/data/file/21069452300.pdfIn PDF document text
    • http://www.520amis.com/upload/files/xigadumarojapi.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/tinevugewi.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/pugamusafatidaza.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/rinibixetaz.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/watomujeweze.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422d0afb6d---61992201764.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/25174641875.pdfIn PDF document text
    • http://master-vin.ru/files/file/valofe.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139a4edc93bf---nekarimijomel.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/witagivukobekufos.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/62329090389.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/gaguwunuxujinig.pdfIn PDF document text
    • http://boldogelet.hu/media/1058788660.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/mebubumek.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/49012663519.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/zetexebom.pdfIn PDF document text
    • 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_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 18936 bytes
SHA-256: ba6295a6d091ccb0069a3811a66d47d7cca9701e615482a186d1834393c95592
font_01_sfnt_off00011f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9B 10584 bytes
SHA-256: 023c7b0f0b3f8ca63d1154c44041b682700299e0107145fe223ac609a3cf36f9
font_02_sfnt_off000137a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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