Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05fa2b6928af9c3…

MALICIOUS

PDF

86.0 KB Created: 2021-09-20 00:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa2fc3f9ea2d3bf4cc7273c95d19585d SHA-1: 7325556a4e55aaa4becc2d1f9ea7501724cebd9f SHA-256: a05fa2b6928af9c3befe7eeaca60cfee9b8f3c6cdc238480cd066f45a994b76e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.jdconstinc.com/ckfinder/userfiles/files/gewozafozi.pdf In PDF document text
    • https://sabunwangi.com/contents/files/81660250822.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c0b22e351---moxenizavudadigivum.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141516e728e8---buguverasofub.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/60161412923.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/78707955726.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109191226052554.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/kugesuxiragetibakifin.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/55923362651.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/25730008356.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/doxakipejefi.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/53633460677.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/97423477196.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gevalavexat.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/40537494319.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613848a40f10e---83771888257.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/patirirarotibe.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/91295351149.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/37635206021.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/tokubelifudifo.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/janixujimuji.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/posufuvuxafukiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=droid+razr+hd+verizonPDF 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_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 10160 bytes
SHA-256: c66a7a787214e0f4c3ffc03be4578e4df79f3e04a6cb7fc5c8df268ce7ce7521
font_01_sfnt_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 18408 bytes
SHA-256: 11a7fa80becc6efc55e91a8be5bc1bf6a1f7ccc402649acbcbdc8b656fc69c48