Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee2748c08ebbd18…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 06:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 87c1ce82bdee3c64f9b2be788e66ba0d SHA-1: bad19768f91bc7aefac4df64fdd08396bf8fa57f SHA-256: 4ee2748c08ebbd18f8de455495c4a8d167020473c355422136744fb675be2029
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inbjnews.com/data/cheditor/0603/files/gekakukezu.pdf In PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/dexuvat.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/29099181861.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/bakojigipupifekotoveluluf.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/tutibaragodibibojadafe.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/zisevatemosafadabilulolak.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfefb65b54---22499954216.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/34922032282.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/dubigebem.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/gumotojexajogozip.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/32741375586.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/ledoziremixipituwaxej.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/jubasamiruwikiwapezixife.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/rkshien37dq0pu7ejfhd6e081n/76656787636.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/nawiwepaxu.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/rifuravuraguxuvapokebek.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146275e71cba---46113697309.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/68751992410.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/subalas.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/zegofepexa.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/59366760589.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b31a33c705---tiluwofozubitovotugata.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/72018228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=index+of+handmaid%27s+tale+season+4PDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/54873715652.pdfIn PDF document text
    • 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_off0000b2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B9 10684 bytes
SHA-256: 32f60c44ec9c8cb70cc8e024103083481fed978f2f491e6bb7f8ae911a813292
font_01_sfnt_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 14900 bytes
SHA-256: 6ebbc36c86ea18d3bb7ab1ec7ff0bae29e43cfdc88097ac9cf54eeb548510037