Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb5177a3b1023c1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 08:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12284e7fe35062e33b11ea9315bd191d SHA-1: 7a11ade7de2ca5683f6d161547457e0cd3e14f5a SHA-256: bfb5177a3b1023c1c06ae3e1551a3564f852bf39300dca63cc99a745cb394b3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics suggest this document is part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3p9ta0kel36v0uhkpi5f17qno5/85761341059.pdf In PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/furon.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/63745643279.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/belaguwomipojuxadiz.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/sugosuxof.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c10d98f33c55c9d4cba097bb29cc38c4/8201741750.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/220fdfbb6f09e008063fe4abb271a16a/sujipijesabepavikale.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/nisudisaguneli.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/c319ea71227d2f4516b0f35c3eff9409/votasi.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/50431034108.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/16048850450.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd1b8e2cf7.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/28314586356.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/78022419354.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/23400340353.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cb7c2003a---givajubap.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/bogabimuxubimapuwazak.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/zasedemezisakomij.pdfIn PDF document text
    • http://seamacros.com/upload/file/89693041515.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/72210131236.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/5045965429.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/47427465750.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/xukikuvisikebigi.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/78292123903.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/54745949134.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/95425754508.pdfIn PDF document text
    • http://chinalabware.net/d/files/kavofirex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cafe+chat+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD749 18100 bytes
SHA-256: 8916069c735bc626ded85a1453e0dd9d832d5e0b87bae7a1a14264b3d056cd1b
font_01_sfnt_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 10500 bytes
SHA-256: 8b77728cd26534731ee0f0a54f5d5a460223db1d056c1f6cfe545e217211a482
font_02_sfnt_off00011e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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