Malicious PDF — malware analysis report

Static analysis result for SHA-256 3174c0de8df005e5…

MALICIOUS

PDF

89.7 KB Created: 2021-07-26 06:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a92f777dc45e2648c5a4836eb876026 SHA-1: 85b656027bd17f2884513a26b36c93fd62e36f5f SHA-256: 3174c0de8df005e5c0952a31eecc104bff4981d01502df3da149eb7492fe3e54
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. Although no scripts were extracted, the presence of numerous external links, some on disposable hosting, supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7005e8867e---99040798078.pdf In PDF document text
    • http://kulturazebrak.cz/userfiles/tadegekowi.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95251561c---zowenenabozatoxugid.pdfIn PDF document text
    • https://sce.tw/uploads/files/60d8b20c92334.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/sebizigo.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/7sg2h625clffnceuf9fejrd3br/bibaliboxoxukaba.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/luluziruga.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/zevimuwire.pdfIn PDF document text
    • https://dacola.com/upload/files/51731959844.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/49774512602.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/gamotipu.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/dojegotivuxani.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2a1b2f02d---29887484224.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/sojako.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16085e46287891---fobeneraluli.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/12537715613.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1q69bsb0eihtm414sj4voldpt2/34244069336.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/99219080376.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/vuradibikipiv.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/33777624959.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/41922784371.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/891638521.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/momufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=salud+p%C3%BAblica+y+medicina+preventiva+rafael+%C3%A1lvarez+alva+slideshare+pdfPDF 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_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 11616 bytes
SHA-256: cef753e3cea69458a71313c2e0dbf5c36a299d702d6d8a45bf6656aa4e226a1b
font_02_sfnt_off00011a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8F 19968 bytes
SHA-256: 8bf7f9c5d718ad3910049d620318f12f5e781599830cf7018bca5a9a26f3deb2
font_03_sfnt_off00014cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBD 1696 bytes
SHA-256: 28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae

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