Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e88736861813402…

MALICIOUS

PDF

94.0 KB Created: 2021-08-19 10:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2cb011bc3ac3940056fb456e22373817 SHA-1: abd3340a07a61f9e0da9a3c2688be91bced0c758 SHA-256: 2e887368618134028db22307c14880b41617dbc84095b5a2be188b4b5b1f558e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/tijisazi.pdf In PDF document text
    • http://www.cddfct.com/up_files/file/94458739449.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/37dbmft7i9ke540humvumtc2k7/45835265116.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/4376182913.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/logujowoloxotakosutamuraj.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/semezalatenoga.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/88274451343.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/sovesekapejum.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160790231375b0---mojipanul.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/06484cd2798fab6041e2baab878ad257/69721639326.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/nifota.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/mrfvsa4u0ob4der56f8o5f48ei/kalelaregerasazasuze.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a24cbbaba9e---67939053461.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/77745008110.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/dumodetajasulin.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/wawiw.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/af9ea032f73f3b778d5c5b5c319c33d1/56636943905.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/e1c7fd051f87d0f62d3757308e09c4bb/liwapip.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/nukizugagad.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/97594929115.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/gopitelixiku.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/lularazale.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/78905145319.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/nopeledubefuwibedibakefuz.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/57689086499.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/6271524789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=exercicios+resolvidos+de+analise+combinatoriaPDF 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_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 20060 bytes
SHA-256: 5c00de58e42c9e21e564a9474d4b4504b746857cf979c6c7e27767b4fab27728
font_01_sfnt_off000135ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E03 10824 bytes
SHA-256: bdd558cc02f1adb7cdfeb2f3bbdd74d7468ff3c68aeb7b68b12eb02becdef15e

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