Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5906b950ba583fb…

MALICIOUS

PDF

77.3 KB Created: 2021-09-03 15:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24007b33603c0c049129f3e84f565e2d SHA-1: e0c8c0d17d95f6b7b6b4429f74bd39f508a4b748 SHA-256: c5906b950ba583fb5067c2bc4877b089509f2d8c3342826b78564a8e736d2e64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://studiofelician.com/userfiles/files/tuxegoxolumisir.pdf In PDF document text
    • http://insureavisitor.com/userfiles/file/dukipupaxipokorugun.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/jasisabiz.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0121573001625536002.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/49969189044.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/95089101617.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a50cce914a---vufivuxonokuloponamawuro.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54e02a56fb---milowawidoxani.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/runaridiri.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a890470b5---20553790809.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/vidij.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/79704359115.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcadf6a4bc---lemimiwunitiva.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/54f06aef8eb6b35df4f25f38fc868dad/34745150208.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/41403802964.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/rigulenipumelututufub.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210831202025.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102cda4d5ec4---podopuzonunulak.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/66979904563.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/fikifutanugijegajibofiwi.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/h34s7k3pifvk83pfcj5ei74evn/ronewisisaxedamelelo.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/9872985578.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/balinikefeluremogowuxaped.pdfIn PDF document text
    • https://thepainter.asia/upload/files/givepekagavuzafenanuw.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123a6dd8c23e---xelubabegeforidit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=jcb+3dx+parts+price+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_off0000c868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC868 10748 bytes
SHA-256: 8692776ddbc94e784a6c8e2f87dec372d90517ae554136ac7511ff5a8023a9fd
font_01_sfnt_off0000e11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 17836 bytes
SHA-256: 8c0136852c5d4e38f4f33c6b1cfe825ae25375609e970c174ee1053cdb0b92bb
font_02_sfnt_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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