Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7db56992093589b…

MALICIOUS

PDF

78.8 KB Created: 2021-08-12 19:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2923a53e890f8781ddfac10a1a161bf4 SHA-1: 8f320688d3b4860b8e20a77439ec09a3eef8e075 SHA-256: f7db56992093589bac6e40f2162f62a7c126d696b1c2f374e2842a575c528397
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely serve to obscure the ultimate destination, which could be a phishing page or a further malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/864bb10a8bed4a93cdbb72f0776fdc0e/budej.pdf In PDF document text
    • https://profix.fr/ckfinder/userfiles/files/salujuv.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6ae4bbfd---12416366942.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/viwipaso.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/xokut.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/zeresuxi.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56052111370.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/vuwutozoguxalilixewi.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/12696023753.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/zerokif.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/83696899981.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/pazupuwikewu.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/47558089006.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/95197565102.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098c28db40a0---ranelojewipopamijodevis.pdfIn PDF document text
    • http://gabortech.comadmin/file/jesevupizemedijofe.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c1cd4f04d087b3be5babed29edc710bf/pobuwikex.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/goviwatenunigupizovib.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/3nk00gn73it3t0f2ihvud2tvs3/dulojug.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ad8d64947cb83fd30692cac0844961c7/8337520356.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/13381272816.pdfIn PDF document text
    • https://businesslife.com/content/file/vatabag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=libro+de+historia+1+segundo+grado+de+secundaria+larousse+pdfPDF 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_off0000cec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC2 11148 bytes
SHA-256: 856f9675321de395aac8a15d52d64ca302371e48332e1a027cb093ca68a5ffca
font_01_sfnt_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001006f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 16808 bytes
SHA-256: 2a04ce70e04b148a59146d9eed45162b067a06e10e06d828c2a6fa53790a45b0