Malicious PDF — malware analysis report

Static analysis result for SHA-256 d133911b7a843fa2…

MALICIOUS

PDF

92.8 KB Created: 2021-08-11 01:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 385816a23df76b45b1f525a536532534 SHA-1: f2da07ab983be19e2ef0d32afa04e5b751648e49 SHA-256: d133911b7a843fa201fc222f144f439c95dd6d2d2dd737b0cc11cd19060526ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to various domains, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://crysiq.ru/uplcv?utm_term=how+to+connect+panasonic+surround+sound+to+samsung+smart+tv PDF link annotation
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/04bfc904376217e03f4cc3ef5b0378ec/86335502114.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f54b84789---42510972008.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/lekivadekadifixa.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/2191182654.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/65026483570.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/83032079216.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f364e639a0---kuwokulabo.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16105c070b2f5b---zojokepewanifovi.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/rakemugefu.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/20po5ji9m5vcgvgahk8okd7d46/89323953919.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/83804296536.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/650e33ee03af5193c8236743aafa077b/75223947279.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/82f68b2865a8bc2721ff3ef16a4578ae/4733348235.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/55180877937.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93f19a972f---rodogozureluvupuwisunag.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/52456542315.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/60639737383.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/fufigizat.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/xitosivenapirarumitubi.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-11/20210511095636164097.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8dee12842c053ada1ba7194507339f21/parolevetigolubem.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_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 11052 bytes
SHA-256: 2cacf6f0acfc4eaec06289699c9bb014e68541b7f57e1327d9c1b8806a5bd047
font_01_sfnt_off000120ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FF 16864 bytes
SHA-256: 8cc346b9c914a3de21eee9da444c053eec3bbb288422d6a46bd719b53e4cc604

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