Malicious PDF — malware analysis report

Static analysis result for SHA-256 560c1b7e478c73ca…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 02:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72c3f2bcc8861916edcdba9797859bd5 SHA-1: 88be09fc3fb4276779c58bcc6d77f6a8a5d6a54e SHA-256: 560c1b7e478c73cadcdef4145e568158fc3b64afb9db087213f8fa699bc76516
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/55952045941.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/tpvraqe969rt3o0kc31epkjmb0/tumajomivugidilaxuwik.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7497799752---87006175564.pdf
    • http://eibich.de/layout/bilder/file/38423233076.pdf
    • http://agcslohian.com/userfiles/file/kugoxudirenekonodoli.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/toe2dc3eopp1vsiv3kmcpo0h63/64313227801.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/465d64eecfa50c5d34a8080b76770eda/53624629432.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8aa6beb50d---jusuvinejesidanojumi.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ebb853ce---sulunolerad.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/8f0abe44281d9ad2e7c586e02a416c14/3475439101.pdf
    • http://alhouti.com/userfiles/file/25768564100.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/7ced098455ef28154bac3b996fa5816f/lesilaveferelezozape.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a498e8e4ac5bf3508a9f7c65726069ef/2627618601.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7c2d1564d2ae0013bbbd382ae784b327/573351624.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c254364b8---lomekexowodilopoxatadan.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf06ed9c0---3193191337.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5df16318b---tuxadimoki.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b49846e800c---44200740694.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6e8e824ca59557918c825501b57b2f71/dozoxojamibudale.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=inflammation+of+the+stomach
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f81b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 16792 bytes
font_01_sfnt_off00011032.bin
b8ef02a38b38165045bd11f8156a517126da0b2d9026651a608a5c13fca1d80f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 10452 bytes
font_02_sfnt_off000127b3.bin
19999c2db4ad3ed65d0b5aa20d48d424ed0eaeb19f5dd923eac5679eb5f8c5ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 16612 bytes