Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ddc9a37d74c578…

MALICIOUS

PDF

100.1 KB Created: 2021-08-14 01:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c0e77a6ab12c72732da36e40da123c9 SHA-1: abef7870212a39f876a95ee4eefb0e00005800f5 SHA-256: 52ddc9a37d74c5783fb3aa0619674dd69d30f9e7f93f013b36c43b7b50e394cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://ekolojikweb.net/upld/userfiles/file/vudogokekuxafesejenafukun.pdf In PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/84617864549.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/jarofelab.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/06937a2906a9f09aea1594a2a3714c25/jewanovujo.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/lixixopesolotitejoririti.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/25052073004.pdfIn PDF document text
    • http://nfc.soo.jp/file/jodoxipasuvowebe.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/11562962459.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107883e360c9---fukijevim.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/42166278115.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160839b9e138a7---9241515810.pdfIn PDF document text
    • https://akemi.ro/hirek/file/jaluvitubumafuxurim.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16087a959ecef6---tavusazowuvisagi.pdfIn PDF document text
    • https://purefeeling8.com/data/file/82918008725.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/fanosatomul.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/51865201037.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f6162cd0462670c52ffaad0bec6fd5c2/vofuzinulidubogud.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076e59a6316d---wodekoxisubesubimovowijup.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/xenuxiwufuzufugi.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090ad4a5bf12---90848884095.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/89eee598a021258d96bcbe30dab1a8e5/lotilu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799a221daa9---65304712546.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/16705628865.pdfIn PDF document text
    • https://roc.mn/uploads/files/62264409149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=definir+cahier+des+charges+fonctionnelPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 16252 bytes
SHA-256: 6d568972154aa9e6553788066da68fe6d5b0b58db67a92e881fdc4c3770f4e1b
font_01_sfnt_off0001220f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220F 10756 bytes
SHA-256: a9ba1b9440ee6141e14756e073b0ba14217c402cef49fb47c5b9abf84ebbf4e2
font_02_sfnt_off00013a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001529a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529A 19228 bytes
SHA-256: e35acfa9858dbe1e2ba94c37cfd6b8abd0d0e3d058889e5ba0f9a07ee3674ccd

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