Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf1d9c7fb73ef43…

MALICIOUS

PDF

94.4 KB Created: 2021-09-09 00:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 689ab9a9d190b3ea4adbd3f17f214e31 SHA-1: 2e7bc78e2eb15b6b5799c1d527f4c9ca0eea9064 SHA-256: 4bf1d9c7fb73ef43f77799318a06554960a9e7c7afc711765947d7f3efe2f72d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. This suggests the PDF is designed to lure users to malicious sites, potentially for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://tcsklife.com/filespath/files/20210909051840.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131703a80e84---gopelos.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362ad0b4681---laxuguku.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/jetabomurozologexuj.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341aa786cec---95236666237.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130319ff40bb---90491992261.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/85232509197.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/56225682188.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/73890303617.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/31172210304.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/xipatigejupu.pdfIn PDF document text
    • http://annabarons.com/files/files/96562468737.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/wojumupiserekurol.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/dewamas.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/temaso.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/jawudujuxopatafeberited.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kigutusumabepomevorunu.pdfIn PDF document text
    • http://insei.eu/userfiles/files/juniwarajovitakamoribe.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/zekimalole.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/54513127610.pdfIn PDF document text
    • http://newshop.jp/archive/file/24230402281.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/16736458123.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/muxirafuzijusixa.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/sefatupusidasuxodapemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=go+fishing+mod+apkPDF 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_off0000ec70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 22928 bytes
SHA-256: f25209e0cc6e574b0183381e5d9fcb1dc50f65e0b146029a3aa58832b03e27a0
font_01_sfnt_off000125c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C3 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_02_sfnt_off00013b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15383 10700 bytes
SHA-256: aa3f8858794b2cbe1858296877497ea811c8576a5ee6aaa1e5bd039c5ccb5b4b

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