Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59d11d4e6bef0a1…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 17:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a342b3d397fec64a38df47ff9929b353 SHA-1: 55eaf6f6f9fd3df12b99a87e88189ae485e4e630 SHA-256: a59d11d4e6bef0a180642a4efa9b5069acb1d4414f6f94d334c26092cc116d27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised CMS uploads 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 delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=6th+standard+ss+textbook PDF link annotation
    • http://biblioteka-belzec.pl/upload/files/32306150320.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/mewiwowogoduwiza.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dafd5b166---4328800211.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/wedojum.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161318ed0d7181---ranodepoxarobuzife.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/74897729986.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/65458067595.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9c115c3fb---47514982186.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b58ae2f28cd8827aa3f710b026cd1a7a/91789117798.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/zadufivugog.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/lidozepejawinapuzezew.pdfIn PDF document text
    • http://youil.org/userData/board/file/kukux.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/rikeso.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-8/20210908000359448830.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/jerigifas.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/31416756233.pdfIn PDF document text
    • http://fructusartis.com/i/File/fifolunoxapufinenimoko.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/5733117208.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/burunasu.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/86732946505.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/fidot.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/63972432698.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/61519433852.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_off0000b8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AF 10612 bytes
SHA-256: 1ea93c3cb4c38bacd6cbb170fe63ad42f558256bc52c7c477374de9e4a824b05
font_01_sfnt_off0000d0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 16916 bytes
SHA-256: d5d85a8c11d11098ea7b24246410ffe84ec9922215db802da8041412c8818d06