Malicious PDF — malware analysis report

Static analysis result for SHA-256 16074017172192a1…

MALICIOUS

PDF

87.3 KB Created: 2021-07-08 06:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2b798b9ec42a57b6ab0a7918a883ed6b SHA-1: 9c322b1f77f4d06109b155531675a8833d3deab1 SHA-256: 16074017172192a19d3fbbfa87d715fbdc8508aff04b987234797fbbdc31eb13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or facilitate phishing. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing purpose, but the presence of external links and the overall heuristic profile strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc7892b88---mapizawevofiborurimusa.pdf In PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/95b63b77176a150038e753d5a07d8592/45270420585.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/24ea8744ca6a73a7487089029f53dede/55344918070.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428135309163.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160e64dde411d9---88412661106.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a13967b6632---mijusezutepepik.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/brpv25gog1f6pbdm0dofupmrs6/bivanademodosukizozapebi.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a0d241595eb3f83f7cf4f224867662c8/dodofejorax.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/mbdvio6pv7t8ftb84eubmle9s5/duwutoter.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/nasosimaworavatuvenunulan.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/55485108421.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/vubizekiluzokofovo.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/532975179.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/76871430900.pdfIn PDF document text
    • https://anfauglir.com/images/file/zufiboji.pdfIn PDF document text
    • http://biosite.ru/images/news/file/1842920623.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/96327957760.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/bob96jara8obo7i43hpri7sne1/14267050235.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1c66a163285b10dde9360d15d69792df/65494214430.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/wejokipomiwula.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/bd048a1f3db7d483144defee9eba00c9/jiwasukoto.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/54443632242.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071110cb220a---xifol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=student+exploration+food+chain+worksheet+answer+keyPDF 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_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 17684 bytes
SHA-256: 8afa3e0e9d47e86b2e4906c3086ceb1991f0f144627baf6a50b229dcbd52bc21
font_01_sfnt_off00011b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 11288 bytes
SHA-256: 4a0e251a94591d17e224003b8269d6afa26ebc49808be756aa020af2e1013dbf
font_02_sfnt_off000135e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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