Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6993dee34a1323…

MALICIOUS

PDF

74.4 KB Created: 2021-09-04 09:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e8d40f231d66644da98d42282ba92645 SHA-1: 2adf90df4c9c092bc4827a44e27921c4202daa89 SHA-256: 8e6993dee34a13230cc7120d81506c6bcf32007f50b0747e0855aba134258fb1
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 websites that appear to be part of a link farm or hosted on compromised platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://floridadressyourhome.com/uploaded_files/userfiles/files/voraloraziwofubexefegope.pdf In PDF document text
    • http://doktor-okonski.pl/uploadimg/file/nenolote.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096275bb7f99---rumekivenunijimibuguw.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/duweratolipalidopobofezi.pdfIn PDF document text
    • http://cartopack.com/Images/file/nafajoribuvanabi.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/37027807190.pdfIn PDF document text
    • http://abc-tel.ru/data/File/4999685012.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/73304121044.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/60593186532.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16082a576c4890---2920079443.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/kekuzotu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/26d84ece72d8597cc99f30116ddcf4d3/nunomizobefe.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cff36e90730---49471259407.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/likaruxozakusomepegime.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/woleposiro.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/zififovetasaposib.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/cigka80tqnb7p5onbk5d4qloj6/20926219892.pdfIn PDF document text
    • http://learningkey.org/userfiles/77623328267.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/97759651124.pdfIn PDF document text
    • http://shophouse.info/images/files/1767200483.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160987eeb89253---16495479972.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vafej.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/nilowelogixoragiv.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/8892307770.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/60c4583d5a1e0d71f1f4730035303464/vizasewusidejizatipi.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/kfltg1s7pn4e4ene4mvneocv51/nuwof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=encyclopedie+du+chocolat+frederic+bau+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_off0000bd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1E 10884 bytes
SHA-256: 0ee7178a52e301dc726eafbfb20ff6e8ea24496028b9b35f37804246ce9819e0
font_01_sfnt_off0000d5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F9 17968 bytes
SHA-256: 1349fdc4fcffc7a56f57dda0865598d0765ff98773824e9dbab228793afeebbe
font_02_sfnt_off0001039b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1