Malicious PDF — malware analysis report

Static analysis result for SHA-256 b571b81be1a44e35…

MALICIOUS

PDF

124.1 KB Created: 2021-07-24 12:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 566a453abc2ed593e35fd6a7dc42cd3b SHA-1: a398603ccd3b795c38b8fbbdc95e40a562cda41e SHA-256: b571b81be1a44e3511ceb1d378a61afa209a936b30a234cf5132ffb8ea9ace28
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristics indicate a likely intent to exploit users through deceptive links, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/6737b3224d1f2851a536c95e06f8414f/40157627545.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98e204db9---zozujezotev.pdf
    • http://i-daa-wl.de/userfiles/jaluveguvulaxesupatinesi.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/nojg7j0gs84ocfcl4dg2kfbvnc/46708170839.pdf
    • https://dunaweb.co/bg_image/files/zanaxonefib.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7af3efd6e---84680949112.pdf
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/23095150834.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d5a3ec31---lamil.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d84c20300ba---sudamejed.pdf
    • https://pypconsultores.mx/userfiles/file/23113145152.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4813037dbc---kuzewodisizonamoto.pdf
    • http://cloverpark1959.com/clients/51168/File/gebidusisopibutaguwun.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/05f258f9562db24e63b35042cfc21b82/69142694976.pdf
    • http://smartvoicecom.com/userfiles/93172639864.pdf
    • http://beiwendq.com//data/attachment/file/dujuvuz.pdf
    • http://augustaelectricalwork.com/editorData/file/92661939576.pdf
    • http://capital96.com/userfiles/file/xulofovanivuj.pdf
    • https://bobecoingatlan.com/uploads/editor/file/61741527017.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/09bd604e396660944396bdcb6b34d1ed/sixadafodotum.pdf
    • http://araonline.hu/uploads/file/99421373113.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47c54c3d74---44610171846.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/tiguratilivosekanepofadif.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/ziviboleke.pdf
    • http://absolutelyneon.com/userfiles/file/22457259074.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/1orac14lflhhtnr52a4qbhe40p/5814258621.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/nt1ktn8agprqjg92fkh9u2722k/funulox.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=change+the+direct+speech+into+reported+speech+don%27t+do+it
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017bc7.bin
3aeab45cd474c80dd2aefb3457a627f24f8114e083f55c0c50f9b4e6926049b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17BC7 10812 bytes
font_01_sfnt_off00019486.bin
2effb04deec2971da7c607cfdd3ecbebf17069cbe8029206774d30fb0b613405
pdf-font-stream PDF embedded font (sfnt) at offset 0x19486 19704 bytes
font_02_sfnt_off0001c6c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6C5 16792 bytes