Malicious PDF — malware analysis report

Static analysis result for SHA-256 445bd837d37808a8…

MALICIOUS

PDF

85.4 KB Created: 2021-09-15 18:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4d5006e5976ad8320b942e26891ce166 SHA-1: 8a31c5c79ffdd7b40972b362f8ab0e85e1a1d8dd SHA-256: 445bd837d37808a88ca705f0c17ed170e85e99000a6862a4f4c92a98baa35632
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which appear to be disposable hosting or compromised CMS upload directories. This structure, combined with the 'utm_term' parameter in one URL suggesting a search lure, indicates a phishing or scam attempt to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=judge+singh+llb+full+movie+download+480p PDF link annotation
    • http://zuche0551.com/upload/file/lowarezofidamonidotaxo.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/3798518592.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/98524328203.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/bomidalalu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50cc6cb21---welise.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/15972274397.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/75330737472.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/91573833527.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a7d29a6d7---3969148551.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f359eb6436---fiwibitoma.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/vumapejisadotidekipujeba.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/37239310300.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/najenaxef.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/15288405302.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/vunewigolupemaribibut.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/ruxofonikiwa.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/81045138254.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/sobunatedipexanoruze.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/nififabuj.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/susinadujune.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210907204749.pdfIn macro / runtime command snippet
    • https://biographiewerkstatt-singer.de/userfiles/file/dulifokagigilatup.pdfIn PDF document text
    • https://euchebnici.com/img/file/ganupabukaba.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/75721169343.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/xemanavonemudugalipalo.pdfIn PDF document text
    • http://aryajob.com/user_uIn macro / runtime command snippet
    • 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_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 11536 bytes
SHA-256: 72b41d07fed951d59c1ba308d2b33aee534dd77b732b58594c0857272e909699
font_01_sfnt_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 17872 bytes
SHA-256: 819b35342c25300393dd40057e639a812aa4e3faa93540769271252a539167e0
font_02_sfnt_off00012f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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