Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f7a928fe90fbef…

MALICIOUS

PDF

84.0 KB Created: 2021-09-23 18:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e8130f7aa0d5c65199ee1b37c095c36c SHA-1: 0089bcb38f66c027186a61734a4c1db12d2cdb10 SHA-256: 85f7a928fe90fbef7201f257ed46dc80e56e564771392121544690b9cebcc54b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with a high probability of being malicious. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://cructi.ru/uplcv?utm_term=final+fantasy+xv+pocket+edition+full+apk PDF link annotation
    • http://bmcnx.com/userfiles/file/1276636820.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614be72995c81---lafojanoji.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/60515791203.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/jasojawenoganoxefe.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311dd759bb4---wabuvubixejodi.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/30018916433.pdfIn PDF document text
    • http://123dvere.sk/files/file/86852957578.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba76f23b16---25176659624.pdfIn PDF document text
    • http://neteyes.eu/editor_up/lavizupo.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/1166412196.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a73451d8d92f3837eadf20fa847bc7f8/kidakijumuzorapef.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/33449097034.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/27803880778.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/91804697887.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/xamiritu.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/89792295547.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/jagofikawojizemonun.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/19803039068.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/migomesonirubokefatibumur.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/pegifax.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/28654495893.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/011811384225.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/55468450957.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/sexuwuzilusezidevoral.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/lawawa.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/tudenapovegowoberuvaxasi.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_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 19220 bytes
SHA-256: f13f9da485ee62814ea461a855af29c55ca0d1ace8e16a6ada40cced13cd45f6
font_01_sfnt_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 10964 bytes
SHA-256: 1b25ffe7116cca8d6e81b582cd5f8d8434fcd77b7becf1e5d315f191d56f13b1

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