Malicious PDF — malware analysis report

Static analysis result for SHA-256 95824d5d6a7009d3…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 20:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0c898405ab41ca19f6d1ca00f579894a SHA-1: f6c42c1626666800e4aa7dd8edafad377b213d4c SHA-256: 95824d5d6a7009d3ebf9962919e659748e0580b8f681ab4c087f1ee937345161
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=office+365+subscription+login PDF link annotation
    • http://baove24h.org/upload/files/84823247109.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/zogiwexiwewigizerifiluka.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090723162125530.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161329d7321836---39425411294.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/47701942925.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/wexejuga.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f30a49f09c---luwolelamelukunibapura.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/leleloja.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/bubag.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/vabovowiviromago.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/pupefowunibizedik.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/97340899326.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16133df6019092---89176070900.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/55344922272.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/319474817.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/legajexoro.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/73959825809.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/48386323093.pdfPDF link annotation
    • https://calmoinc.com/upload/editor/file/tutarobefoxinadizinunuk.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/18466596471.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/37094345564.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/diburoririnulumugama.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 18760 bytes
SHA-256: 64c9d301683a78fcefccafc310669290907421270adcecc568ab1dbb6cd14fe4
font_01_sfnt_off00010c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 11232 bytes
SHA-256: 6e137e659cd8d769be59ffa1a97414a3fbe33f3c1b5946b871f3dd595239c15b
font_02_sfnt_off000126a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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