Malicious PDF — malware analysis report

Static analysis result for SHA-256 7891e7412e13737f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 07:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38ab73253ad34e16f19f5d1da1661aab SHA-1: 27c38ef6e912dad5ee6b7fa56400e2f8b87ee729 SHA-256: 7891e7412e13737f83c7a101a8009c73f663435c4ab4caf2120fd54fd05696cf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites and is flagged by ML classifiers and ClamAV as malicious. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech support scams. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing attack vector.

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 https://2acontractor.it/images/file/mapesifuzil.pdf In PDF document text
    • http://hugslock.com/app/webroot/img/files/zazukibejixifilu.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/gavesidiw.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/wikeseni.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/78412918040.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/nomexedo.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/jozonolo.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367e19f00c0---posatogarifegura.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/j96uundg7vm2evuqatacnfqc67/14785121739.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/suritukolop.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/giwurepozabeliposomevegaz.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/sajikirakibeseze.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/11118095088.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/fuvunezenurunakibo.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210915_45296F83B0983BAB.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/xebelokovegujuruv.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/tuferu.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/c2c07c315da845b99f9bcdf9af316bd4/29088209469.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161386faa6bcc5---62456924439.pdfIn PDF document text
    • https://efnnma.org/files/file/2263298694.pdfIn PDF document text
    • https://gilbertems.com/videos/file/rolutedeletuzagut.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613100fa1aa01---90224008711.pdfIn PDF document text
    • https://esz.jp/img/editor/files/954745552.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/49273800634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+touch+lockPDF 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_off0000bd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A7 10180 bytes
SHA-256: bad0fe61dc0f6845c6a7b657e453e0d92bedc41604107454a116b6c83c6e0bec
font_02_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 16604 bytes
SHA-256: 751cb6d84a020f150539464ea5f49ef42c787fca30c9d1d1df204d7b11d783b9

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