Malicious PDF — malware analysis report

Static analysis result for SHA-256 887a1a3d78577200…

MALICIOUS

PDF

182.0 KB Created: 2021-06-27 15:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 29426a79af6ae37ba08e1a071d3277ff SHA-1: 83a04adbef35785411b399f39a284e12b7d4fd3d SHA-256: 887a1a3d7857720017be4e8d1d561590805cb6772808fb816e45b33d2559f1f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 6

  • 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.
  • 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://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9da744588---bolifefugojabib.pdf In PDF document text
    • https://fanaf.comarticle_ressources/file/dusibitezekumebibenop.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16205228912452.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27e4378d1---boxemutumimawe.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/73640961011.pdfIn PDF document text
    • http://susutour.com/userfile/file/17348033336.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/48741203012.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/banofog.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/66663511452.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609007072d10e---supozilapepoz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad09caa62e---wimaxiwekepojuni.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/vumewerefevifapekuwiluzaj.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/if8n5fnq0h2eq497vc0ups3pq4/45047691655.pdfIn PDF document text
    • http://altinay-law.com/images/file/45315731467.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/42053143339.pdfIn PDF document text
    • https://cmoretv.com/userfiles/ximunodikowadu.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/mozakaxib.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4d52dff9c---41769337134.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/vunigumojipalosenawekoj.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed2e89b18d---29077695285.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/wonuvodogusanemoxi.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/sk6stm8q63unhbqq68u99lg897/ruvad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=recorder+flute+chords+chartPDF 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_off00026378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26378 10520 bytes
SHA-256: 7360134e8e231d29a0158300d77e836f8eacf6fac7fc9c1b49865ac4c9384d0e
font_01_sfnt_off00027ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27BA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000293b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x293B2 21488 bytes
SHA-256: 2a1f05feab1595a6397dd762618c9dc51b0630de323f1b01ff43c2d3f07af82f