Malicious PDF — malware analysis report

Static analysis result for SHA-256 305507dc4fbb31ec…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 09:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92358e7102115ef22ae7c84cad562a6a SHA-1: 19fe0f554aced38bd0629a0daf6fae1589c9d7c3 SHA-256: 305507dc4fbb31ec62ffdea69828824f202cb76a1aeef696029b574fb4ed18a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://tomaszskiba.com/userfiles/file/27866107248.pdf In PDF document text
    • https://taxfirma.com/userfiles/file/70808924935.pdfIn PDF document text
    • http://noelex22.org/userfiles/file/powanedovirili.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/wekatamatawawopizedefos.pdfIn PDF document text
    • http://proart.by/media/file/vutubupemuditoli.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6e1611462---zibelasuzu.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9601ba3b12ce777357d96b04b786592a/86319996288.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/babawuwus.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/40386890939.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/77546237407.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/xopotenodododudusew.pdfIn PDF document text
    • https://attack.lt/images/files/94958054641.pdfIn PDF document text
    • http://lse.hu/userfiles/file/48395465416.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d3f2334361654cfa44bc1aee287928b8/39038018672.pdfIn PDF document text
    • http://laduses.nl/image/file/61139576932.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/xoberapegarugulidek.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/gakiwuvoxudoxuxepulefuf.pdfIn PDF document text
    • http://birdwatching.sk/media/file/69397727284.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3309992208.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3c47a96bfb50e44f07eefa055e560fa3/lulufewisotadawati.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355a8583be8---40228791640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=english+book+pdf+downloadPDF 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_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 18076 bytes
SHA-256: 3495a573c426a25b89183efa47d116b1f48a074fbde0b7a1027683d1455203a8
font_01_sfnt_off000115ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E01 10748 bytes
SHA-256: cab9629d074dfbbfcc22336efb8e87e6102a65325f2e915ced68d960b87c0488