Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3bc7e39a624adce…

MALICIOUS

PDF

74.1 KB Created: 2021-10-09 14:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c7fb1016d73b8dc83917e09737f7022c SHA-1: 7cc9436efb46268290cf469dd20c5bc9d86a2dd5 SHA-256: e3bc7e39a624adce6856aa878023e221a05a583e1db77368adc83c5c023a4ce3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of external URIs and link farms strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ketchas.ru/uplcv?utm_term=easy+piano+letter+notes+for+popular+songs PDF link annotation
    • http://life-homeshop.com/asset/uploads/files/lojemigabizopunogu.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/35427297421.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31550193701.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/jodebi.pdfIn PDF document text
    • https://foulardfotografando.it/file/wevelepixaxobomuvilim.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ac0f36e5a---nujoxiwiviwajulerek.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc9b8231a2---fulenasakerimufikadiwute.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e079f3b6f78db788200cb580bc2ff9f0/luzepubojenaxi.pdfIn PDF document text
    • http://uteambio.com/upload/files/gupusakanog.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/5872480281.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/xowevejekufuwiv.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/67467893431.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/zesaxomi.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/lapudakoto.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/81757945830.pdfIn PDF document text
    • http://artcvajk.friendship-match.com/upload/files/lexoruzoxasixojax.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/37103381268.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/dubetobekeb.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/daribudijulivogewa.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/33565022337.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_off0000bddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDC 10728 bytes
SHA-256: c3f0405866ff72f4a0011b101fb131b58ff9e8fd9a86d884cdf28ec8d96810bb
font_01_sfnt_off0000d6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 17132 bytes
SHA-256: 958a5a7dc6e1497bf3ee59a6c99ad28d8867e878fd89f0eafb1348d938c36039
font_02_sfnt_off000102cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1