Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd87c1fa2270843…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 01:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 43467daa05536a592c9d1c708f21208b SHA-1: 36cd4fd65c2126f1fa22009d7d4c0265cf7fba33 SHA-256: afd87c1fa2270843b223223a85039381cd8b75f8867f6127c79ac01c871b1e7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://nikosdimos.gr/userfiles/file/suxozetofeladamijib.pdf In PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/pipuweferabipam.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/topetejugarudejanizurav.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/lulowerukexivagesasegisup.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/368c26b977e3f2508db7db6aad6346c7/mupemilopavuvunavol.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/26281807475.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4717aebd7---79877576431.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/tivimokidinuzadukuletisim.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa83aed9d---98524421026.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/62350839003.pdfIn PDF document text
    • http://jogamiskolc.hu/ckfinder/userfiles/files/67603981346.pdfIn PDF document text
    • https://langumeistras.lt/i/File/33290644343.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/bda235daece5f896ba99092dc9885755/49096534032.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/xorobutenovuxaxexini.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/36836453740.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/27816234594.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/runiwebitemos.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18065468308.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/38416561571.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/nobelodapazozadopafavov.pdfIn PDF document text
    • https://rjpexport.com/files/vuzawugazatadabulebejefev.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d6e475837---62495512233.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/81176974631.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/89336159906.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pujaliruwib.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/67161905854.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/19875453986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=force+of+will+rulebook+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_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 10476 bytes
SHA-256: 69aab24730f015ccc37c602902c59a7ee91553382958cfb85a4511fab3faf98d
font_01_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 17732 bytes
SHA-256: 71d6b5e3ee37f4afb06f3b4151659aa367e6a9fc8b3a7188e82fab4835b2dbae
font_02_sfnt_off0001227d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1