Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6e332ddbeac440…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 22:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 15067730dcce062b1aa422c27abc9479 SHA-1: 681e2fde1ed63b6b676a39284817a09030487920 SHA-256: 5a6e332ddbeac44087e6c08038c6ddcf890945b268bfb06e1003925f4af45c0a
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially harmful websites. The document body is heavily obfuscated and unreadable, suggesting it is not intended for user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=world+war+polygon+mod+apk+unlimited+money PDF link annotation
    • http://www.cafeinca.com/img/public/contenido/file/7642784317.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/fakas.pdfIn PDF document text
    • http://infosierra.es/images/editor/69460626011.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/72769673131.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210908081649.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/22742139558.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/23011817232.pdfIn PDF document text
    • http://pvvc.cz/files/tirumuze.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bc33e3636---dazidivodunulozefu.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/vanagadigidenuwoxajuv.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/48680756757.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/54346916811.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613607366ddc0---9867656729.pdfIn PDF document text
    • http://meditopthailand.com/file/32988889378.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/83573689441.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/71686203513.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/25844199668.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/49021253388.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbbc0578c5---gawijebivojiz.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/gewoduledajo.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/buvexijelabedun.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/jodutafosebexugaw.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340ea628d5e---sewejebotapasonuzasipog.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_off0000cfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDC 21084 bytes
SHA-256: 8241b472032e010e4be44fb05f827c31302ca50e01424131a3775856b73bbad0
font_01_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 10952 bytes
SHA-256: 1bdc434b1de863c2564c7022d3c85d0f1796b6043e5a9977d83dedb4e6a810e5

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