Malicious PDF — malware analysis report

Static analysis result for SHA-256 53409f1de933da27…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 22:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5708fe6bfed826f45681f39489bccfec SHA-1: bb801ca9072b31d7a4c45b715f54ec35236d40f4 SHA-256: 53409f1de933da27f44ec6dc342afaa0be566b970bca3239635fe77036fa096f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/d4npn5pngt8bt64kps6tl6shgd/64034490573.pdf In PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/dodafapivotepa.pdfIn PDF document text
    • http://lukinserv.hu/file/57180636461.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7fdca8849---jugalajukuvixuzugudug.pdfIn PDF document text
    • https://avflash.nl/upload/files/73957979453.pdfIn PDF document text
    • http://masonhn.com/d/files/jetowuxonebonusumo.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/dbe5532d7d1e1600f49f1d4e82fdd356/gasovid.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/xamosawiladotuvuxijige.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/sawipipavobigimise.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/xopoman.pdfIn PDF document text
    • http://theponghop.com/upload/files/wepelogejakudakureg.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/36037767418.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/56567905900.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/209656525.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/kosuwamojadonid.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/73862824815.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/pujarubukipabux.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/09210312909.pdfIn PDF document text
    • http://afro-safari.com/upload/files/28326328252.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/91205188814.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/14858340719.pdfIn PDF document text
    • https://majubesar.info/contents/files/taguvib.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/buturisexekilumijavites.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=diamond+rush+original+game+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09E 10784 bytes
SHA-256: 8ca8585c4b27a17f7dd22c8a0264f25df0b03c2a01959b4349fbed1b8d16aff3
font_01_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 16816 bytes
SHA-256: 8a61102c370d8ffb0d713b1c8a60f5de69017ff528570f7888274e1970720155