Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b23f9392aad2a5…

MALICIOUS

PDF

103.4 KB Created: 2021-07-22 07:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e992d6ed6e8d7a23b521190a29102de7 SHA-1: 8fd0e659519c24eeae1dd61d77c2281303c2daa2 SHA-256: 45b23f9392aad2a561d32db12c92bb86c4350b21ad29b33a44549aa81064b02f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm heuristic strongly supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://15thstpresbyterian.org/clients/d/d7/d7025cfb1d4df99eee5a588ecc3dd57f/File/48310229777.pdf In PDF document text
    • http://esipro.lu/userfiles/file/favusutop.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/pojosanadobujapidakupi.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/21088219449.pdfIn PDF document text
    • https://biocoils.com/img/file/85736553053.pdfIn PDF document text
    • http://derma-dts.de/files/file/33813664072.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/39209884679.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/takodalero.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/36240422092.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/zadeketoferigeduzep.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2da4492db0.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/65092564339.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b061a8262e1---sowukuvaje.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab51e4b33c---gerozogaba.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/90127224347.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kbprrpc12rt325jnt2cato6r66/nolirupipunufiwuxijejo.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63b9c2df1---lunutasaxiden.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/45290018111.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dabe12cccc---86564967766.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/86179712077.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/86884969677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cbse+sample+paper+class+10+science+with+solutionPDF 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
stream_004_off0001434e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1434E 19208 bytes
SHA-256: 37e5dfdb6e79a55242241c42cc9a0471434c056d120fbfa33733340534e942bc
font_00_sfnt_off00012b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17611 11168 bytes
SHA-256: d87e431860d971f0973ef798bf9e56d5a2867203079d76e780d1e19b7e9a1e12

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