Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fe9f6ab10910ba…

MALICIOUS

PDF

75.8 KB Created: 2021-09-22 17:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7616ed12a71edbbf3ef2968e5eb9392d SHA-1: 93f71a4ede602f11331242720511022c8f12e42d SHA-256: 16fe9f6ab10910baf3cd538e9d6b4818ce19294218e48e67e2844b466b30cb25
196 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it uses a social engineering lure to trick users into installing a browser extension or update, a common tactic for credential theft or malware delivery. While no scripts were directly extracted, the presence of numerous external URLs, some hosted on compromised CMS platforms, suggests the document is designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://huntic.ru/uplcv?utm_term=change+android+emojis+to+ios PDF link annotation
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/pemoli.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/ponotaxuwejita.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/pixuv.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/lemupaf.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/dezew.pdfIn PDF document text
    • http://c-six.it/userfiles/files/1172191871.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/219299c610f968cac873b6f569ce4dde/ropuxemutonobazuk.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/mumafuzeniramalimil.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/81103176722.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/tizebe.pdfIn PDF document text
    • http://vtaky.sk/media/file/84882335537.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161498af06b2e7---35119296468.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/doposizuz.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/24693519135.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/31119953375.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614137e1c751d---30382373057.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/42665727255.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/gurobitor.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/laleranapegebibizaruxep.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/vimigutabuvet.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d5e1d7f7107a16c4bd53e021f53167b8/69294368634.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/zazukozubevinemov.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/68768077675.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/gimuruxiw.pdfIn PDF document text
    • http://ingore.cn/upload/files/dagapevifosomemusekaxomam.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/sovijizexozof.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/18417543184.pdfIn PDF document text
    • 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_off0000c20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20E 18112 bytes
SHA-256: a29d8dfd85907c194cb44c5036ad618d8ec826c371457dea04cfc0258470c513
font_01_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 10812 bytes
SHA-256: c195a8774aecbbb7a9fecd10a33366ca22149451cb48f0559e0346fdecadfe39
font_02_sfnt_off0001099c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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