Malicious PDF — malware analysis report

Static analysis result for SHA-256 8309745af37e43fd…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 06:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: decbf90992d9be6ba0e92dac63084073 SHA-1: 5c3d293b0483b3d9db88e6d28e5cf7aedea6b165 SHA-256: 8309745af37e43fde5dbc702a2712b49b37e763254c3e6818a0cc253a6ddc0c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The embedded URLs and the overall structure suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://labuchedeberce.fr/userfiles/file/kefedenolezemudirogiri.pdf In PDF document text
    • https://stauber.lt/images/files/52782324389.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/34906541495.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d04d246f0---gupedelikazewexowi.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/62476943338.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/motumufazuvidukokuwuzata.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/7056076924.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210908140714.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/gazurivax.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/sevogofoni.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210913_065923_189.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/soratojefumema.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/boniluzevepegibukoledade.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136975d1dfb1---sonuvinuxekaleragorusu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614141e6d85f8---gimeluzawagijunexovujepi.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/sirivusevinulawatozi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431df8e99fe---49252655372.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/29327125966.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/42858084356.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/35095976759.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/82954876475.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16143e579e9686---vaxiso.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/vopukokodenixu.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/tixudot.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/14841003762.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/fivogavoxedonoxavokad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mobile+phone+volume+boosterPDF 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_off0000c8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E2 10652 bytes
SHA-256: 2780b9c1eb10a66f8cb08ec20e787c91607ad7d6d52356355595c1fca9a52de1
font_01_sfnt_off0000e0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 16684 bytes
SHA-256: 4f69fceae6c300301ec6bc236ee770553b673e20d372af678c462e7f48ac268b

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