Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4b69d515861970…

MALICIOUS

PDF

77.6 KB Created: 2021-09-02 03:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3899de385bc408fd59b3a0bf913af1f3 SHA-1: 6219843b59f1796cf43b035f1a56b216cd0ebe35 SHA-256: 8d4b69d515861970d7e238cc00e670e72a0c4d66c5639db417126a0ca120b32d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded links, many pointing to compromised WordPress sites and one directly to an IP address, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern indicates a malicious link farm designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c78fc35604b---denaxezigirixozu.pdf In PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/c1489fa9279d464c2351a15621002b52/93493821452.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f343d5f69b---25541573563.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/21864422214.pdfPDF link annotation
    • https://oncetrabzon.com/resimler/files/94591587585.pdfIn PDF document text
    • https://10s317.com/uploads/files/202108232355046217.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf96e6b098b---97200678197.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cfd6c9ab6---wulosu.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/25241337067.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e7f6c2316---ponob.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860c8900006---bumurufikoro.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85e5350fe---23656375097.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d91d4969d---96413885393.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210810150710_2011179443.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/bi0no3t0l6kn1nl2b34e89i9ot/69204065220.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/6642592045.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/8b04d22f28b23d9875518a901564f961/31024889120.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/16783339270.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/94407123482.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/45775123944.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/27126267480.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/31306799481.pdfIn PDF document text
    • https://asiabiru.com/contents//files/54167965341.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608009dcc30b6---612282775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=home+surety+titlePDF 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_off0000cd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1F 10208 bytes
SHA-256: 675abd249bbc5f84d43bf6d2772c726594e58c2efcc8762b3fe84a27e84f24ea
font_01_sfnt_off0000e409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE409 17084 bytes
SHA-256: 2d663615bec1062a114fcf390527604fe36b74f6f30aa8544d12e5520b6af943
font_02_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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