Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6f30dd91bd8aa7…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 23:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9876bd9470c49b79156a1a8e728d9da6 SHA-1: 9f3b3f291ed9428b357915952b78f89df156904e SHA-256: df6f30dd91bd8aa76ed2e9bac87eab49cc01beee8bf8a8e17e43e9ac3543d7b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS upload directories, suggests this PDF is designed to redirect users to malicious websites or facilitate the download of further malware. The primary attack pattern involves using the PDF as a lure, likely delivered via spearphishing, to exploit users' trust and lead them to compromised resources.

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=shadow+vip+game+guardian+latest+version PDF link annotation
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/moxodezukejatuwedepagixi.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/57265272538.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/63666476859.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613600ecdfd27---93062352680.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/65299352985.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/67283057265.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/90922847237.pdfIn PDF document text
    • https://yasacompany.com/upload/files/vasofogode.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/64919624904.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/71505610267.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/jopokivupinenezo.pdfIn PDF document text
    • http://potya.com/60292789367.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109041738231718.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/74751368504.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/mbr2ta2mjvaijtae16if3jv734/76924895029.pdfIn PDF document text
    • http://packturf.fr/files/96728290727.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/wobepulalisogikugak.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/nomatemuzadumegomesupa.pdfIn PDF document text
    • https://kermanrooz.com/img/files/18328119795.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/nujifiketesudabupuvobi.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613457e5ecb67---84051346049.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/jibarelalesolagujiriroxi.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_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 17144 bytes
SHA-256: 0d3630a637fb7787850a8caf97c3c275780139751d83342066247671500bcd91
font_01_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 11168 bytes
SHA-256: 76e6665de8ed8198743b44996473950772896d8547159c0e010504b8550e776e
font_02_sfnt_off00011f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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