Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eafb272bc901694…

MALICIOUS

PDF

133.3 KB Created: 2021-07-30 13:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 887d58d0381ef1b7623efaaf71fbc2d6 SHA-1: 8d4f505ec7e63bb91397ffce274053aaf2e1de0f SHA-256: 8eafb272bc9016947a6dd714b19884323a7bdd8fb474563c4be767071e7f9cab
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://angarakshaksecurity.com/userfiles/file/74779277977.pdf In PDF document text
    • http://salocchi.it/userfiles/files/monowipotur.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/c244477191e67e112d690d59661ae11b/vigowigunuxagazisilu.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/dupubajenitolipeg.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/93838689506.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/ruzam.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/suvipaledujijujododugoj.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/57055321655.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/39760409955.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/47582518502.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/00abd6e7d0bf7bf23e420b9abb9297fd/64292395182.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/penuxipukatokugemokiwi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a5d7786b321d17c0ab73dc62d2569f84/75765977565.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/b10klv625ngomvbl4295kcuoka/xigubafi.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/14167175198.pdfIn PDF document text
    • https://exxontel.com/file/7687272426.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/lopilikezivusiromo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c473ad0d0---movovuxaruwasuwosubako.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c310fa80c3---49981750580.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/a3k1bu01kl6oqpgq2pmc3bu5cn/zomafanira.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/badidimumoxizesiti.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/074b1c2ca4afc4fc50fc5cc9593a3406/15181645549.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7cc7e89044f00a5597a502024390a0d1/50319170872.pdfIn PDF document text
    • https://clinicscrm.com/img/files/rijunimi.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/18272020950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=que+es+ser+comunista+en+espa%C3%B1aPDF 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_off0001a0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0AE 20756 bytes
SHA-256: 4cd3db177979311ef93fc5a787ce337ceddbf93965fb76acbc31a4fd37dfab72
font_01_sfnt_off0001d437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D437 10856 bytes
SHA-256: 34fdf2fe79ecacf747aaff60c34482a60432f8ed7e1308e37cbf6194f5eb5dd3
font_02_sfnt_off0001ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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