Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0490c055c50a81…

MALICIOUS

PDF

71.2 KB Created: 2021-09-12 14:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4dec956e0e0a2d87840b0abb291e5972 SHA-1: c072272deec2d3001848b7613c05d54770393322 SHA-256: 8d0490c055c50a81ed164d86129ce9f4d5940fc3607928b9e247294383cbe9de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document's structure suggests it's designed to lure users into clicking these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://archism.ru/uplcv?utm_term=android+for+iphone PDF link annotation
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9ldg6hiarvn11q90jbb9qb2p16/14556498697.pdfIn PDF document text
    • https://frisch.ro/files/file/67911692478.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161340f2e9ef2b---mimiwivij.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/11/file/xizadekogugopazazu.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/nisigubozojumoxawi.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/40013616699.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/51840409862.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/gaxitoluxigewokebu.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/71500120221.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/nesebesa.pdfIn PDF document text
    • http://vuason.vn/upload/files/60267761080.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/hb7prsoot6snbci1drbdvuijha/30854348975.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/6146268584.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe8901423---wujarataladufeb.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/xotisowejusugodapedodepo.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/nuvapimovurexaxukegita.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/28887580592.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/41821215078.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/gulox.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/wubirogofudi.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/babixazapewif.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_off0000b738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB738 10104 bytes
SHA-256: e64e58ab231be6c47e8b6fab1c255348b333c58c638fa2b08073d3bf4e017c0b
font_01_sfnt_off0000cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 16500 bytes
SHA-256: 0b5603e9f355d43932d9f7b939b611318fc61c514d07603188b81df362fcebdc
font_02_sfnt_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1