Malicious PDF — malware analysis report

Static analysis result for SHA-256 fabf5a8776de4dde…

MALICIOUS

PDF

117.3 KB Created: 2021-06-30 01:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f34d5e4369ae29a7ae846a61618c34c SHA-1: 67bde973cbf832316175f4e203cfd509b6d243f3 SHA-256: fabf5a8776de4dde53ce35c12faa4cb5ce4ceff3a3755f31ad3bbcecf5a848f6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm with numerous URLs hosted on compromised WordPress sites and disposable domains, likely intended to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://acutecardio.ru/sadm_files/69036625048.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/a38d9lbtg7u1ekovkbsgb9la9f/1963961495.pdf
    • http://timeyear-v.com/userfiles/file/fuwake.pdf
    • http://zxpgw.com/userfiles/file/mugitokorusot.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b659881e8---68465291476.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8be3adf4---93125732571.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2245de0f93---wolazilibiloduwiwan.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/0d68307fd2b5f56a4fc822e9a0e5a144/rikuvovegagezizegolilim.pdf
    • http://euro-ex.com/zelokimavivutowefovupi.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/17loc7a9ckk0e0tgaa7d8f1a75/43333421069.pdf
    • http://campbellelectronics.com/uploads/toxifowisokemununamokoli.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854b142b13f---zonorixunofapuvumibowug.pdf
    • https://narimasu-chintai.net/jcfiles/file/30857059503.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/us88vn4svidpm0tppk45seo421/29179936945.pdf
    • http://capitolmetrophysicaltherapy.com/userfiles/file/famobezatorugatif.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/8bf711dcd297f9d4efcd66f69f11b36f/gipajemojubuwilo.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092510c04270---32956534691.pdf
    • http://tai-group.com/upload/files/86087171402.pdf
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zopuf.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/cs1i6p2lmvgcihehgempdtoaqb/kubexigoligidizuju.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a7032fb8ada5cd9c38f0c8065b58325b/zavopenixiditogazixazeli.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98226930219.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/50235442990.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/be63916fff0c00a1b97acececfc24016/mufuwati.pdf
    • http://adabaskimerkezi.com/upload/file/gatavekomavejeke.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=probability+density+function+notes+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014668.bin
b4d68d1226d2816075933808fdc2c38fae19d7239ca9b316ccda2fd6c821633d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14668 10968 bytes
font_01_sfnt_off00015fc9.bin
325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC9 16084 bytes
font_02_sfnt_off000174f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x174F5 16792 bytes
font_03_sfnt_off00018d07.bin
bfcee9077c691707e4655c806932f2a38e7f19a3cd01a9b9b97362a8e5f15aee
pdf-font-stream PDF embedded font (sfnt) at offset 0x18D07 21196 bytes