Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f8f6cf574643d6…

MALICIOUS

PDF

75.0 KB Created: 2021-10-01 03:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0c27a6571959b3d93563e9afd3aaf002 SHA-1: 1b99eb51c2f4a332d704f4781bec2347624b7364 SHA-256: a2f8f6cf574643d6766f15a221cad8791e835a77814db7f964597dbb572cc5d7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the nature of the links and the PDF structure indicate an attempt to exploit users through deceptive content, likely leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://giahung.tincorner.com/uploads/files/17182713254.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d8fb4caf---zapelaj.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/70b96c324c643aed5eec182dc393677e/lisalipalasi.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/2287568156.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/4qvb3fv6hacuefv6720u6csg05/venamopawizalas.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/wokuwexoxugixozu.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210927072806.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vumozupaxepotune.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/nezifitamu.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/welekidawuluresu.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/nuliguretawiliwizexem.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/wuvikobifagezatizo.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/gomute.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/napitubofelub.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615249e3ab2e0---dinokemipibodepa.pdfIn PDF document text
    • https://plasterglasgow.com/fwd_docs/file/22331089589.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/sojewazebodabewoxosimovu.pdfIn PDF document text
    • http://chikatere.com/Upload/files/50444027352.pdfIn PDF document text
    • http://gysanya.com/upload/file/210915223503612674jg3bnkimxwi2.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/26204086419.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/35853749953.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/51327896129.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c38247897---37031009512.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210902061026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=apk+video+live+wallpaperPDF 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_off0000b9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D4 10240 bytes
SHA-256: c6b1ee7ba11cb2c5c17f1bb32fd4b952b0a03ca1e15be037c28f8be5be354984
font_01_sfnt_off0000d0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 20632 bytes
SHA-256: 1d3ad1583293a3f64046989b6896aaa6284c7e555545265cf2ff2105884da059

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