Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ca784310093746…

MALICIOUS

PDF

89.9 KB Created: 2021-09-06 03:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 86abae8d28b60aad937102e7e7372492 SHA-1: ecd5c17507eda067c0c2ed727e71c6454758a881 SHA-256: 11ca784310093746f276abefc3748c27733932223eba66b73992b5c46a7c6257
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a callback lure heuristic further supports a phishing or scam-related attack pattern.

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://philabc.ru/uplcv?utm_term=matrix+full+notes+pdf PDF link annotation
    • https://upbilbao.com/ckfinder/userfiles/files/9691239289.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/sepokijigunobojito.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/6067ac60861e8a51f345252e8736c7ab/21513749554.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/36001174584.pdfIn PDF document text
    • http://bjallstar.com/upload/file/84164338048.pdfIn PDF document text
    • https://doitoutdoorz.com/file/jGj51nFn4Uff7PT5.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/46286194452.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ecc023123389d6625e93a3a61f8d9b29/95808174418.pdfIn PDF document text
    • http://kechengchem.com/upload/files/99760711581.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/tewinunitub.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/78929788909.pdfIn PDF document text
    • https://icbacademy.com/upload/files/bojijizupewezos.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/vupakedibivaxoti.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/jaregonomab.pdfIn PDF document text
    • http://timebymtm.com/upload/files/29061118422.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/24202637667.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/25563888140.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098c662f36b9---nerik.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/juwipofojakukerexiwaxokej.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//nozorejolugurijepiwaxije.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/42912243050.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7225fbb4---gifibesag.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/makesujevorivelewis.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/runusetixegevekizugose.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_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 19232 bytes
SHA-256: 86ed2e714bed83feb3171008661c7a9eba995291db47cc7a5c4233f2aaaa97c1
font_01_sfnt_off00012938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12938 10684 bytes
SHA-256: bce7e6f7422243b3a06ec45853cc32b1bc2b16b169060f12300e246c8d52d48f
font_02_sfnt_off000141dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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