Malicious PDF — malware analysis report

Static analysis result for SHA-256 b062c9ccd295a7b1…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 02:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 758cd49583f75efa1b54cff94da0850d SHA-1: ea6e36a37bc53a92f9932141a6bec51ff787221e SHA-256: b062c9ccd295a7b1a95b20c79aef8bc6229e9856208c1b511b5b1c30ed53fc6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting it functions as a link farm. The presence of external URIs and the 'link farm' heuristic indicate an attempt to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://vipdiler.ru/files/file/mikokiti.pdf In PDF document text
    • https://arvikabc.com/images/uploadedimages/file/sizuzon.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d02f473c1c---vafadologa.pdfIn PDF document text
    • http://hanifeugur.com/image/files/36055051828.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/jelukojudomu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614912478066f---93311612656.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/lezobegimidujuruzides.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/kevokasifigemevamatig.pdfIn PDF document text
    • https://beleznayauto.hu/galeria/pictures/31439711677.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/tilajen.pdfIn PDF document text
    • https://bagstyle.uz/images/file/gisejudejibab.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/5e74522b3a80420141af9627c6ed525a/jakululigevurofoki.pdfIn PDF document text
    • http://lagrupacio.cat/file/fudavekerigameneta.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/roroxilesetopobubi.pdfIn PDF document text
    • http://chieucoingason.vn/files/69357614376.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/rataresud.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/gemefafutemo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b4d48154d---43844703476.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/zarojekiwokozabipulolasi.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/44818284121.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/17274242206.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/57276869078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pubg+skin+hack+2020PDF 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_off0000ad3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3A 15408 bytes
SHA-256: 80b18f4ab5817383f575e5bf305794cd827d715d4b74303063452b81069843fc
font_01_sfnt_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 10588 bytes
SHA-256: 03b499007d2c8039d7069467258bf543a84334decded7678b43517197536b2dc
font_02_sfnt_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1