Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4708996f6545a9f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 22:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 04188a021502140a69c7c9897c0c5bf9 SHA-1: b3628a25009824c05796d5b13a7e5b2192608afe SHA-256: e4708996f6545a9f93230c7365ee203d677443ac9c610373b4abe39737a46b4e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://travelport.pl/userfiles//file/verubejolek.pdf In PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7dcf10d32---gozezulogesotof.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/petoguwipig.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/weroxewonokivedekoniw.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b6f02c65b---55537682385.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/73207314993.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210526205225.pdfIn PDF document text
    • http://nhandieurangmuoi.com/ckfinder/userfiles/files/kowoguredosex.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/6554841833.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/65664738225.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/xejenigagiru.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/48083445475.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f35bb70c0cf---6267690263.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0ee1dbf2615cd1acb427f1d44f077850/1076647728.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/5a008ac438e379f50b0987d36afe5e7a/fiwedewozoperil.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/23335059033.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/47862531096.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/wixuzuvuw.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/lenitawuf.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d7edac4a---mosufigux.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081027f1bb3f---jazazarifo.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/nodurosopebevibis.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093d4a65a000---17977524065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=telecharger+des+livres+pour+apprendre+l%27anglais+gratuitement+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_off0000da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 11232 bytes
SHA-256: ec9182a94a36f53a5a2f30ec617c9b64fbf12e14258f691f244f1fc0401103b1
font_01_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 21676 bytes
SHA-256: 30a141c2664f7d16d8421b53199b0d77aa4a01f540c41480c5a8b454eed33df6
font_02_sfnt_off00012a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1