Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa433555a88808a…

MALICIOUS

PDF

100.8 KB Created: 2021-09-07 09:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 95d79297a54b1622d6099de7da631289 SHA-1: f5553b90c54d3a1ea6b3dfb89c230f9de7404d8f SHA-256: 5aa433555a88808a5519231e6213731a6cc3fc10d30788b3e58971477262cbf7
156 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to various compromised or disposable hosting sites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ya-ke.cn/admin/upload/37910089647.pdf In PDF document text
    • http://aktifimmo.lu/userfiles/files/81734305324.pdfIn PDF document text
    • https://seikai.jp/free_images/files/5180410884.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8298c7270---dawavebuladib.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/nidemazanasuzoxiv.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7ac36e1fed96cf5bb5d07b9a59837876/luzofi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c853f562a85---66505988943.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/luguzuxi.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/68755798265.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b061434b39e---kuxex.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/runaje.pdfIn PDF document text
    • http://atya.eu/files/file/70891920215.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc15abb756d---10877321366.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/kozuseb.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/31121608491.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/lexaledurudixukozavimopu.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/92273610449.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/mevafita.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/82767314163.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f0005565d9f0c6621b39f9e668625539/befabewakogupo.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/wuzisoseximiwogajux.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/c62c98ecd91a99b9ba334b73f24f2f9b/duxelibilure.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/49667581722.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/4114527508.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/70157503979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=in+christ+alone+piano+solo+sheet+music+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5C 20944 bytes
SHA-256: 8b356bb46a9c126456220b61af1acc7efd9f302c5d04b66e65b5424d549f6f09
font_01_sfnt_off000153d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D0 10936 bytes
SHA-256: d9353845426e7bb6ed47da8f4f186d1dd33217e2c40e45b4e6ce91d8d95eb470
font_02_sfnt_off00016ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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