Malicious PDF — malware analysis report

Static analysis result for SHA-256 983d5d1638c1f2f1…

MALICIOUS

PDF

74.7 KB Created: 2021-09-24 10:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e5a814dcb910a2d092bc472f231add1 SHA-1: 9d78bcd556781b34beb689d3f9f0312e5f31b8dc SHA-256: 983d5d1638c1f2f1b575c382157bc764deabb0cdaad3af72a88ff98801f22674
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=fs14+hack+game+download+apk PDF link annotation
    • https://baxsporthorses.com/userfiles/file/fakunegifevigovorolovaje.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/334ba73f47199544ca4bcdff70363a70/wakibetenaremaben.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/tumodotenoto.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/xorivolawopesofosomaviboj.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/lovawevibaxipabi.pdfIn PDF document text
    • http://baove247.org/upload/files/4537051223.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/novuru.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/23237172419.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/62145381293.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/viledigajapise.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/3616999487.pdfIn PDF document text
    • https://subded.org/userfiles/file/16590076178.pdfIn PDF document text
    • https://equalland.com/uploads/File/54282428874.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6111e254---46225951930.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/tunirafiz.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/dobakebebika.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/98010777932.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/13670103819.pdfIn PDF document text
    • http://kim-clark.ru/files/file/wawaxozadudetobixida.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/fanugogezifimepukotaza.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/413862bb886118c6c5a8406ab39cc97d/ralefudifaxepobupaxexi.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/rofenagetitawutofodi.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/suluwub.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_off0000c0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 10956 bytes
SHA-256: 958a8b304223263798b7be0799e71f8c76b7f28b6bfdf6b36e313408a2444964
font_02_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 16868 bytes
SHA-256: 3914854c0d8ce5b470a02f2c6dc314c38f38e5c7bfb3e22231e5ee91efb5ce1e

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