Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac292749d0a5db1c…

MALICIOUS

PDF

92.7 KB Created: 2021-09-18 03:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3f356394fa85538a84c22fc5df90fc4 SHA-1: baaee72986f1981b2a3f4495db780710924a6340 SHA-256: ac292749d0a5db1c41cdad4c43f9bf2a54c8a5079ec3ef1382b7cb50b358b5cd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://creteotels.gr/FCKeditor/userimages/file/sejitid.pdf In PDF document text
    • https://panelshock.com/userfiles/file/49144867946.pdfIn PDF document text
    • http://metallpress.info/files/76311238976.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/4516335762.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/90923967311.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/64046847284.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/94390940103.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc1d7fcec---50067984244.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/07i67q36p2qn8afk8pakul21i0/kirutuzinokur.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbb9547280---xubafibiriru.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/6286251205.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/37589596130.pdfIn PDF document text
    • https://arerp.kr/data/file///20740817799.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/52146621310.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210913204649115.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/87262304949.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/82000346787.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/gedililesa.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/50944044629.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/79275258465.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/faxerevox.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/ropazilefiboxukazadanop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=walking+dead+season+2+123moviesPDF 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_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 20568 bytes
SHA-256: 3e55d5daf289f47c51e9f664ae71ded9b59417076e86bc09723f21fd0c12b752
font_02_sfnt_off00014c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6B 10888 bytes
SHA-256: 5050d00711d9b8747a58cf6f467b1db63ce7da8693baac0897880d59636164b2