Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e82160dca822119…

MALICIOUS

PDF

121.9 KB Created: 2021-10-16 19:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a5ce99bda8bea334e1964466ff612776 SHA-1: 07d5afd2610653a02b86a4b8d7d39c97e2329fc4 SHA-256: 8e82160dca8221192485de379523283ff3d9344678e36e014aee8aae305c1ec5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://kleinschadenexperte.de/userfiles/file/nupeged.pdf In PDF document text
    • http://yuqiaohome.com/uploads/files/202109222253143324.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/73996722317.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/vogisewofe.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfc0f2d6a1---tibivomewanavefunegepat.pdfIn PDF document text
    • https://ottopianos.nl/files/46504183606.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5e4d3316b---39467275000.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-24/20210924004812582342.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/97259386080.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/21645205882.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/28451374057.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/94979419859.pdfIn PDF document text
    • https://12shio2.com/contents/files/18620853908.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/borezupotewanoliparudiko.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/58195406730.pdfIn PDF document text
    • https://nexapos.com/upload/files/zoranobefonaz.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/gelugukaten.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614f67e60e4b2---25930879435.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/59160765419.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/3hhmbih4if817u58hu7meommdh/42741924688.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/ruxaludevijunit.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/dawitomozijifeni.pdfIn PDF document text
    • https://granitnet.hu/editor_up/delebopipugabedikuwu.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/goxuwerodebenorumenurizom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/4dZi1sgP-vI/uplcv?utm_term=all+trophies+god+of+warPDF 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_off00017785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17785 10740 bytes
SHA-256: 560936e254c6916185c6ed54bf900ac36dbe648e10962370cb2e0e57aa0a2869
font_01_sfnt_off0001903c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1903C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A84E 19608 bytes
SHA-256: 80b80a4fa38a9f38498d3e375232d32ad6462d318d48b77ae9ef423b6cc418d2