Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3914045674cfefb…

MALICIOUS

PDF

69.6 KB Created: 2021-09-03 19:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 644c9b953eca77e360d57f16dd546834 SHA-1: c71b7dbeb1eca5a91cd2ace7d2fc1b4299035ea2 SHA-256: d3914045674cfefbb7b1f455cd17ec45c9c5f080c57cb9af6d58c5a27cf2e1ba
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a screenshot lure, a common phishing tactic, to entice users into clicking a link. The link directs to a PDF hosted on compromised WordPress infrastructure, indicating a likely phishing or malware distribution attempt. The presence of embedded JavaScript and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/2c1ddbb5f21f6b09143cc0496e80fc9a/33835545884.pdf In PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/bivonegawex.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/morivotu.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/12356255260.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/05d04ca86ed6fa12196b426faa7faf53/18449421033.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/39329857442.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/fdc2538488f6315310b4ff7bae4aa863/31987352642.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210826171203.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a45b302d---44208367162.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/boduxefemunipewowuguwaki.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/rlaemmpakfeetl3nv3l03pf2a0/keluronopix.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9d235b25518e949f58d24327528b9599/kuganasizesida.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160876e032e404---sibokar.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/nikadunukef.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/63506578448.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160775f707c337---jadewo.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/pexapeteladakatev.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/lirez.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/dorulel.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bfadc8b21---runezapitepozuxo.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ec7f4708252967ea281254a0e26fae06/88815605422.pdfIn PDF document text
    • https://tavio.ru/files/file/madujud.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608115f981d66---8682113324.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/42147296288.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/dadesugezapekixize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mathematical+expressions+english+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_off0000b4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D9 11164 bytes
SHA-256: 14fa07541d42f5758d3ba8ab7c4efcc6b1c2669614007ac59935a284f857e7ca
font_01_sfnt_off0000ce92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 14048 bytes
SHA-256: 24a65bc2dce88007cfe0ba9aa1c2447656645bd26740480f47c76f18a188c767

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