Malicious PDF — malware analysis report

Static analysis result for SHA-256 45011ddb1bbcc2be…

MALICIOUS

PDF

77.1 KB Created: 2021-08-12 08:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd10d87920d430b03f54ab67fe4aedae SHA-1: e1866fcabc433d866bfc779342342572dee0d518 SHA-256: 45011ddb1bbcc2be7baafc0da72fbcbca1dfa01e02327d2ec3cc3713ee4221c6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's part of a phishing or scam campaign. The presence of embedded URLs and the heuristic for a callback lure further support this, indicating the document is designed to trick users into downloading further malicious content or engaging with a scammer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d2d856bf5---98793886516.pdf In PDF document text
    • http://coinproject.com/userfiles/image/file/71610353320.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/10214836289.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/27129414868.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47745184909.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071169191352---jebekivovepaketivafil.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d063d9d8e---59273776945.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85079dfc61---sisagonunewozugomu.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/93252689497.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2f9e7a102---92274257196.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7daa3db2d0---4798270690.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/xibepasutid.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/fufojevemubovu.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/07decf6575b4bf7a4dd16e25e56e0044/96477487711.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/52930580954.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73502061988.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34667a025---dajulidosaxiriromulo.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/sofosaxokog.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/fb384850512d2d2170c612d3d9706ad6/zumoli.pdfIn PDF document text
    • https://soechi.id/userfiles/file/97283280048.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/17615534346.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/zejejurejedez.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/wikobe.pdfIn PDF document text
    • https://eurotechcorp.vn/admin/webroot/upload/image/files/48835190196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sbi+bank+new+saving+account+opening+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_off0000c915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12C 11008 bytes
SHA-256: c7eebedf3f0495435473f34cba6daf4e08a2f35c1bef26741d449c2437311412
font_02_sfnt_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 16776 bytes
SHA-256: ccce541bc4018997b6ccddec5dcff7480d8a5dad9b8a522d058b079657a5f422

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