Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7e0c5dc9ecc958…

MALICIOUS

PDF

89.8 KB Created: 2021-10-09 02:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4b7b0c92a70f1c87526f77280dfe59ed SHA-1: 8fff0b4ab8fc062f7d35f53363fde1fc4282ab80 SHA-256: 3a7e0c5dc9ecc958dcac8e2d5e1805cd57253e22fb2c5f34486281f67122e66f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites. The document body is heavily obfuscated and unreadable, providing no direct content clues beyond its structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=glass+lookout+grand+canyon PDF link annotation
    • http://lsphc.com/userfiles/file///79856178655.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/76161020309.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/79284779454.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/61686842225.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/30081125315.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/34287975631.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613a274830866---napuvi.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/80140952253.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/66a487ac5e610fe26255462621e5f245/wudebazasonuzu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f2415fd15b3c7f977b8f80473730a6ab/supokojifakivoserem.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/26075284128.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/fetexewimojopitej.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/tigalegalalegefikurimufu.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/rezuveludetiranetotivaz.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/loroliz.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/11186834988.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/12467815937.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/bg5nk1b681q1gsahtppa7t33r3/82329660467.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/d18squcj991fiv1uoa6rbn8o12/66895762884.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/79901844992.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/terugo.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/17060013380.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/40132062893.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_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 19488 bytes
SHA-256: 052038bd00dab0d8434aa8dfcaca04f4283c71b092febd5f484d8fe43d386fe9
font_01_sfnt_off00012933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12933 10668 bytes
SHA-256: 55956bdfa5b216f363342888b925a1a0cf7978c77936d70abef667402e68eef3
font_02_sfnt_off000141a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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