Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d573090608a2f9…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 06:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5667ba2391e159c13d2e9cf0e7549543 SHA-1: c52311438198ba8c6736da70a233b175225a046c SHA-256: b1d573090608a2f9ff99c24515d7d2e50120e557777accfd61e56c2b03bd8976
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable or compromised domains. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://garglob.ru/uplcv?utm_term=vince+vaughn+wedding+crashers+painting PDF link annotation
    • http://ukonlinedirect.com/userfiles/files/xozaneve.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/3e248aa287fd4f74ca8e51b0accc7493/91992932042.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/bikikakilegamedugebiti.pdfIn PDF document text
    • http://sro52.ru/uploads/files/lezotujewobuxofexape.pdfIn PDF document text
    • https://seger.cz/userfiles/file/4584753074.pdfIn PDF document text
    • http://pk.mo/userfiles/file/xigofosi.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/jiwowat.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/90403311680.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/patilupefes.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/80710731406.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/gumosopu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138137bb46ad---losudanuwigikefezusumev.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/74813806629.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/12963746699.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f736ab49---10011851530.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16136ace3735c5---nomuwoxujuzewedamabar.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137a65013c24---sirado.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/nikuwugezapaxuguxakuf.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/94296524956.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/86770263615.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/sedivotuwuluvivukadedon.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_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 17708 bytes
SHA-256: cb075b48ff8a49618920319a86d7597000fa3fe05888cafa9f4d0fbdc209d1ad
font_01_sfnt_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001284b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284B 10848 bytes
SHA-256: 187bc1e200bf64ac2905db66b7f1aac7103a38d13b34a2236af513a34d9e0aa2