Malicious PDF — malware analysis report

Static analysis result for SHA-256 575a404014b2ffcb…

MALICIOUS

PDF

68.3 KB Created: 2021-09-12 18:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 443efa707b052aa76574b644c3b23da3 SHA-1: 9af824d47bf3b85e1116be29153ae097dad24e53 SHA-256: 575a404014b2ffcbe076594c5f22c29d2af35af0e9f85b6aa31846fd33aa7942
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded links. Heuristics indicate it's designed to trick users into clicking external URLs, with many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a malicious site for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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 68 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.
  • 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://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6af68d30d---51433440346.pdf In PDF document text
    • https://majubesar.info/contents/files/78292657156.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/kavebene.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/28480134589.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/toxuko.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/46244077775.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/kulekisarazew.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/38339245866.pdfIn PDF document text
    • https://lesura.net/userfiles/file/2600069576.pdfIn PDF document text
    • http://hak-al.com/resimler/files/91997486062.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/medoku.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/30570278618.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/96622610485.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/39833549745.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/zatafomivokut.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/28443279278.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/68588875031.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/tawalodepukojebet.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/62039780793.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/fovuma.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/1837471961.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/bokemetulelufuf.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea1e0c49f---xifivoduri.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff28058fd1---risekonuxavasuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=from+pdf+to+rtfPDF 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_off0000b324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB324 14088 bytes
SHA-256: df622ed1dea522d41455c0a46655afdcb7e0884da528162598662db502bfe964
font_01_sfnt_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 9932 bytes
SHA-256: 69e6c15420bec54dee6a7c65f1f13f17ba907f2686c160a0c4d95c49922a9868

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