Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf925d000f1047af…

MALICIOUS

PDF

72.6 KB Created: 2021-09-10 18:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27daba9d2ef26046ee52e41c6df86ea4 SHA-1: 1af019d7ca389b9279fd74bb167a039e4d48c517 SHA-256: bf925d000f1047afa41501133e99afcfd1283bcba692487e7061e0da9e1b7566
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's structure and embedded URLs indicate an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://gulfsupremesa.com/ckfinder/userfiles/files/85072418426.pdf In PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/wuwis.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/76680875673.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/cffdb5261ced3e7c1ae90a0ffb860cf3/movujijepanibiluzovifanik.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-10/20210910170734902285.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/43471446670.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365d45aa981---68029217290.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161325a6a5196d---14756435659.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/3d5b8fd26c5bc77e8d8e45b77f71feb1/wamatipurogusekoverazetef.pdfIn PDF document text
    • http://youil.org/userData/board/file/tanelojajatasodaxojo.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139129bb3bd5---konejarijeku.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135bce0324a2---fufatokebuti.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/geduzutofotejokevazal.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/xulitejotovabuxisej.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b6a2d9088b46afb69f640bab05ccacad/tonara.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090204485473499.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/pojanosaf.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/matunefuluvenobevu.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/kusekijomafulolufituwu.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/zesogivaruda.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/mivag.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/95288370461.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/xulilajolo.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/rumenaravofu.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/8559254905.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/902697073.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/vetifezopazegelegexu.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/buzalaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cricket+exchange+mod+apk+2021PDF 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_off0000bcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 14832 bytes
SHA-256: 18de00be24e05d617d0918f7eea6a0da2d1d9060f465dd581aeb2e5164d28ed9
font_02_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 11264 bytes
SHA-256: dcbfc506ee82132d7bf00f2f66a52ce596451fd41a6e67ee892883f059e84ec2