Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d39936377c59d8…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 03:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 18fcf571bbfde25e472ca5836becd19b SHA-1: 28ee3fac7b8901842722040b1cd7cbb53cc41bca SHA-256: 84d39936377c59d81e8b769bcd6f3ab9d45af4eced42cdeeff10868c7c1410c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://wastran.ru/uplcv?utm_term=construction+stakeholder+management+pdf PDF link annotation
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3aa0db53178109dd33df00b972889f0f/14475321250.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/1355d172f544f6a795353ca96b7059ca/11180824032.pdfIn PDF document text
    • https://beaszemin.com/files/finopemozazetonaxenapot.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/zokug.pdfIn PDF document text
    • http://lg-palette.com/upload/files/sipijeruwu.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/87020033711.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fe50df32d7b---danuvufewojifazebed.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/35560828659.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94a4793b52---37213265046.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06f72e6611---rabomeke.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160851087afd7e---tikonufesazibufomojutuk.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609067384781a---dupivib.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/49429575125.pdfIn PDF document text
    • https://flyags.com/editorResources/file///94333994982.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/89256619951.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/fqlcfa56dkpu1imtcc230igqh4/faxabuwukegubuwiluxusad.pdfIn PDF document text
    • http://salwex.hu/file/kovixodujusoporepenir.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/sagobote.pdfIn PDF document text
    • http://suara.ru/img/file/92296675535.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/o8ujvtg9vo6pquc8pfkrhv8d91/18271895729.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/toxibalexuvola.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/shdqgno1klbargti8i6t2n0t93/70125751165.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/kat4dumh81tl9vbfojkitmmqko/mobikutijis.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081f20319f13---mudoxolapazawigubegi.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/8259480918.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210607/210607122432482964tkvm0tg68oum.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_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 11288 bytes
SHA-256: fbe74456c55eef2df7fb0ff5f6e03496af5108b7c8f55238aa3afc625934e716
font_01_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 17428 bytes
SHA-256: d6e3a4c8ecf2931a56914437867985bfd81f182813e73a86a8ef0d14943574c4

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