Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b90a49c92834d6…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 10:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6839f7daac1f377e59ef83059409796d SHA-1: 7a0fba4c5b678fef2262853d9e4b6daeb7871af0 SHA-256: d3b90a49c92834d6053da93d942e4f6e7e5f79470f6ef86bdaaf847582ed0e15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting an attempt to obscure the final destination. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archbot.pl/files/file/wunugesisamedakofaxolox.pdf In PDF document text
    • http://akgwealthplanner.com/crm/files/95743810105.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/zidaperunumulirix.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135045616b4b---tepewem.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26997179296.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/pobubejelonavum.pdfIn PDF document text
    • http://elsped.hu/files/file/86426842079.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/safez.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/11539957237.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/meneviza.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/roduxalezukawufifok.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/dekaporabanutasinowubipon.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/perawatil.pdfIn PDF document text
    • http://skolky.info/foto/images/file/21622620113.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/5690024177.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334bcb7ce81---75645088720.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/dagederejalidiraxamugin.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/letol.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/19231500966.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/rizetu.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/82682581310.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/rakajonododato.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/63512276426.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/40892393061.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135299c3590e---28085292469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dragon+quest+builders+2+apkPDF 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_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 18204 bytes
SHA-256: 22b90a798af2f2d2d7cc4d9802e022b77981f5b951f6bee360b9838436a5980b
font_01_sfnt_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 11168 bytes
SHA-256: 0003b729548b92e2348c5509f80c1e6c29e589e8b9c74cc30c37c301ceadf487
font_02_sfnt_off00012261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.