Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b443b6a0669292c…

MALICIOUS

PDF

76.2 KB Created: 2021-09-08 04:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d270e72b3c996c5d8c266ce7d6dc7a0c SHA-1: f7f8a713a7a2a5d8b475cf7fb773e2225ee6efdd SHA-256: 5b443b6a0669292cdf64dd2ec340bd7c2c86318a0da69ec34de2380c64d4c80c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://bursakaynak.com/userfiles/file/jadav.pdf In PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/sulimegaf.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613123d8890a4---lonituzikilox.pdfIn PDF document text
    • http://www.siposferenc.hu/html/28178305361.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/kekujul.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/fopakovotixovitotogux.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/60995529342.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/titaridorimepesenuzem.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/77610212524.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c85cff0418e---midisanidokasetona.pdfIn PDF document text
    • http://meta-min.com/files/bulakowo.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7e6d0b16f9f3628342cf3126e1a4398e/sadugebukuxapedasasez.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/mufogop.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ru0pptte96bf72e365lgl0hg46/torijir.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/babapajozawom.pdfIn PDF document text
    • http://htwy.com/upload/file/23021946377.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/wusosa.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/nemimavekodobazuvepesazog.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/28461641089.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/jenigumofelijipa.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/45564546565.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/xogisosatoxuladolor.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/80397828732.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/ravusufefekujumizuzosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=multiplication+arrays+worksheetsPDF 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_off0000c56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56F 17284 bytes
SHA-256: 0a6c30ce38ef092cbe1682fead55a7fee7e1290dcb8675c9d74ee9e1145cb21c
font_01_sfnt_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 10856 bytes
SHA-256: d02abe9cfab5001966c9188d1a29d28a32bf64565f3db98c9b83486313cf075b
font_02_sfnt_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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