Malicious PDF — malware analysis report

Static analysis result for SHA-256 90055d18bde4abe5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 01:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f8743206c420ded2c8cd63dd481e9a98 SHA-1: d76d9d96378589ecbe425d88c36af8dae4bcded7 SHA-256: 90055d18bde4abe5f45882a09aa9f885c54fabb2746e59f8c88591269f53bb5a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mzlpro.com/web/img/podborky/files/10425521359.pdf In PDF document text
    • http://weifong.tw/fckimages/file/58507434797.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/04971828c0d22fb8eab7ba1300c96f9e/66604094875.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d694c7367---zenalo.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/39931946362.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/balowupotejujalezajipeluf.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/34986934949.pdfIn PDF document text
    • http://bctlorraine.org//userfiles/file/81378379811.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/3c1afd732a5be33d16f17120112c0bcb/28041563204.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/baregedopisu.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/degazig.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/lovareza.pdfIn PDF document text
    • http://mfahk.com/upload/files/pufitenim.pdfIn PDF document text
    • http://teplospectr.ru/images/files/xugajetu.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/dabofujofokowitofoluw.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/tewutavasodujojoxigako.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/20145814775.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/38162176560.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/kapobesolalenapimuf.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/40073990331.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c34fb2854a785c798df5e4979ab9bda6/zagaxerapebimipun.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/9462418093.pdfIn PDF document text
    • http://waypl.pl/upload/File/mulejene.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/vegobatameputajupedumala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+miracle+season+book+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_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 10980 bytes
SHA-256: 382fd4790aca5d144516e2d71e0ea56aeaf6c41acad4b550896f93241df987bf
font_01_sfnt_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 17740 bytes
SHA-256: 75340cb096fe5ccaea5fc1ec6c72c3bac7da1917d3b64d77cde7faf72e19f15a
font_02_sfnt_off00012781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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