Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9ea04d4b516e60…

MALICIOUS

PDF

87.0 KB Created: 2021-09-02 04:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff34787ed64c804c49b059a9448dec7c SHA-1: af7eee5383a9a586ed18b10f7702498b6c69a2d9 SHA-256: eb9ea04d4b516e60aca6244cacf0af35047f1d9cbee53f3096af175b59fd98cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs, including those hosted on compromised CMS platforms and disposable domains, suggest a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://medvor.ru/uplcv?utm_term=emachine+user+manual PDF link annotation
    • http://hungthanhauto.com/luutru/files/73216520392.pdfIn PDF document text
    • http://mamitobe.ru/files/file/69663408888.pdfIn PDF document text
    • https://soliangco.com/contents//files/fajovasebipuvorabaweloxa.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/bifikotob.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/juzipomogimasutozabo.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/mozivuwerajeloramigagelo.pdfIn PDF document text
    • http://elitvorota.ru/f/file/49883663418.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/14316745963.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/levetesu.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/zatonevusukomedikasef.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075959b5563e---39951042512.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/93435229058.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/jivagifimemubemex.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120077f03bfa.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/melaz.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/mibolenisewapim.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/qv814agsr0f7betsnr3c8fop65/nemafetipo.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071291c3b388---xomolukazutod.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/wefasozafalonenagezizoj.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/jopogebes.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609477ed46ec9---napabuwigelalekeb.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9330479c0---godowizaki.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021083106581573499.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/8afca6c5586a802f0de69ebe2b3e3cb6/xojivakimuran.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_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 18220 bytes
SHA-256: 5f92df03921f73edd68578c0328f59baf2148b2bf3e54602a672ea2a9866fb7a
font_02_sfnt_off00013698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13698 10360 bytes
SHA-256: bc79fd4805cc191aa5012e1f4cd0968dc5f70a0297cc526963f86c7dfe774767

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