Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae31776ca53de574…

MALICIOUS

PDF

71.0 KB Created: 2021-10-11 16:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c8e52bb49c58d7f581b96b18a4e2a3ff SHA-1: 66c85e0483bcfa4c8e1445401db557ac6e17face SHA-256: ae31776ca53de5743b7ce5816c3b5adec493b679caaaab5fb4765d67e214faec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crysiq.ru/uplcv?utm_term=adeptness+meaning+in+english PDF link annotation
    • https://clinicscrm.com/img/files/55515041203.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/6498276902.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/79516340775.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/36971270871.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/52895316153.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615452a9f0d72---vepozajamarewanu.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/rikejumolusoxopupa.pdfIn PDF document text
    • https://huanghecables.com/d/files/26437574374.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/98122382649.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/vatesegitafefubaxetavokad.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/a17ee58df263ba1847ce2e3bbe6ad9bf/javoremedazujuxuwizuren.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/857b53dda18de936db155e60b17f4814/domor.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2ca89537798aafac380f5264fb9dd8b6/didenexodezinizafiximelo.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/vewivupegenafafifixo.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/fugasagevavulinunipemezo.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/soxajezigu.pdfIn PDF document text
    • https://wildnaturetravel.com/File/36847492914.pdfIn PDF document text
    • http://wwstationery.com/files/file/23814997000.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/rosiwofamefesalanafoluv.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/40968890760.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a7e5f0c59d---jokurepapojafuvalif.pdfIn PDF document text
    • https://mkontakt.com/dat/file/rodudaraxakez.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/99180578727.pdfIn PDF document text
    • 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_off0000b57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57E 10600 bytes
SHA-256: 11c0329d13d7d4dbef5876abc65c4d24c6cbe34f79637b219cbee30a4cbe44f1
font_01_sfnt_off0000cd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD44 15904 bytes
SHA-256: e22f5578012f5534220d8d90289c919622fb713f1022664404a8dc4e339d364a
font_02_sfnt_off0000f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.