Malicious PDF — malware analysis report

Static analysis result for SHA-256 8404165f1e397865…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 13:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2373392c742ac1182f5cbe70b235977c SHA-1: 56be8c61e653cd6fd5f6290644aa72eb16fefbaf SHA-256: 8404165f1e397865821498809ba344ae88ae3d165a190b7bd9b959651d1aea26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to host and present these links.

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://infrive.ru/uplcv?utm_term=how+to+get+video+from+android+to+iphone PDF link annotation
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/tebodikarifimawiwamiwu.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/levigusimajupi.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/83356737255.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/82742214518.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/rexulabaxula.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/8345695847.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/65395893808.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/januwa.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/70817208309.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea05f58f6f---zifoxodidasudu.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/nigogaregulozinazoxigif.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202199162132884.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/17338055507.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/9ed50ca6a383934731ea1d0fe7e35516/7952302940.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109060744025366.pdfIn PDF document text
    • http://olympusflights.com/files/files/25444733641.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/16585831022.pdfIn PDF document text
    • http://mosjob.ru/images/file/zalofeko.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/rixulukafelanisipune.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413dce0e6c4---39436125098.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/31156885346.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/2622927733.pdfIn PDF document text
    • https://aneri12.cz/res/file/zemexiromiwuvujexunitu.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_off0000d2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 17804 bytes
SHA-256: 89332f50cab5c2fdf78a3648509573b90c820e5cee0c2317b7da4e5a61ec2548
font_01_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 10876 bytes
SHA-256: cf76c15126c3f488458cd3040f5e7af2f5a4ea01355b95a35c1b110838f9a58c
font_02_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1