Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b40883dd515c459…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 09:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef8ef4b34bca83915b10ed246854d200 SHA-1: 337c5cd4a0a2bda8b1f31bf0753341b092226924 SHA-256: 7b40883dd515c459e01cd0b78ddf0c026660a819452ba2c68f520a9a0c26df3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a malicious intent, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=secure+score+portal PDF link annotation
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86fa168b1---10304241.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/58967476389.pdfIn PDF document text
    • http://vaynhe.com/upload/files/busorigotudexufetigixizop.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/60971376744.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/65211642837.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/84584754882.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/29320529593.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/nixuguto.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/57870724802.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/negoxul.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139357c179e9---92232840919.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/97060313ab348b6d457180cd79eb7854.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/87040582326.pdfIn PDF document text
    • http://baove247.org/upload/files/sibisutopitoge.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/85028048312.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/28741847760.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/gezubododowitegovufajutij.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/94154186994.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/zepiribugodojutazoz.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/wasuxaxete.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/viwakevexutegosasufi.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2bbbeecb---verizokolepuperige.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/97796597047.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/xosasotusoze.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/95215125155.pdfIn PDF document text
    • 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_off0000db89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 17716 bytes
SHA-256: 5c58b2b808d477b4c879e6bca8076c15844750cafd9e6f5e9949246f3c68461d
font_01_sfnt_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001218d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 10344 bytes
SHA-256: 32c1a5f1b378076d1c85d759c1a4895dfe79dda0709e4effda1379edc00011d2

Open this report in the interactive analyzer, or submit your own file for analysis.