Malicious PDF — malware analysis report

Static analysis result for SHA-256 236ab6b4160be771…

MALICIOUS

PDF

98.3 KB Created: 2021-09-01 17:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b4f4af52ec803847a8efefe37da27402 SHA-1: ebe8089980dcc99958a7bb246bb09754364d357e SHA-256: 236ab6b4160be7718db0d8300a94fc0edbe39dc54903f21ddee254f77951a9e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to potentially malicious content. The presence of 'utm_term=mortgage+sweepstakes' in one URL indicates a lure related to financial schemes or sweepstakes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160834830336f3---46278835593.pdf In PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/lobumulomisipesalixu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a968ed38ce2---68416200940.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/81087142767.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609885d3a36da---sixelazuvoxozo.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210530112257.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2d67b324729b1ec265cd40f8f9b54b91/gujibopenorekuxezaru.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089f115746d5---43861770794.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/musoj.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/db7d95af67b56fb4a04c8abf693beb8f/98096966852.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ck7biicn87m6h33i3kv08mggm7/ketulaneze.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ceaaa650cd---wojogi.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/fidesedofuzajo.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/18988061473.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/1069848147.pdfIn PDF document text
    • http://www.toptehnik.si/images/68813274090.pdfIn PDF document text
    • http://davis-wilford.com/clients/5/5d/5d1655677b271656441dfc21bb295863/File/48702899788.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/4047961667.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ggif8tgid7a9m18k4sciq8vp3l/muvolupez.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa68d924d9---sonad.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210802_0930F607917ACE1B.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/nidekenozorojonegu.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/j45pkn172plr6l1fgo7q66u1ih/85065692816.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/babujoref.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999f17b915b---balowojijurisazun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mortgage+sweepstakes+2020PDF 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_off0001188c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188C 10596 bytes
SHA-256: 0c21708baa99f72e3f2731f098b5fcf6f1ddc3c61117e4a65b59133f2447eda4
font_01_sfnt_off00013117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13117 19280 bytes
SHA-256: 7cb951e333729fc5aad4f3691c07b4d6f36f68d5c60db28666e61c8e1e411467
font_02_sfnt_off00016359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.