Malicious PDF — malware analysis report

Static analysis result for SHA-256 409560d55818873a…

MALICIOUS

PDF

98.5 KB Created: 2021-08-01 01:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f336424ce751bd9541fb65f78890248f SHA-1: de5d6725705094d93ff574393119a21bbba74139 SHA-256: 409560d55818873ac9399f6063480804e0491aec52343c02bcebb7829376b7bb
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to lead users to malicious content. ClamAV detection and ML classification strongly indicate this PDF is a phishing trojan. The embedded URLs and the nature of the heuristics point towards a phishing attack that leverages a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16099f7f9bde48---xamip.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed247db790---60601118349.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/zojakamagipowuz.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/20893254258.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/lorejifejimugolego.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/aomgnajv959p9jkejoqgeutmfj/72017341555.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/jefibewawesigodisorin.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/22277693324.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/kegosusopuxufojorovibiw.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/22923654717.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wosuliwizanodevefa.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/fetilikogubifisidan.pdfIn PDF document text
    • https://bataretak.com/img/files/file/74460889198.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/39107313.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ef2a5710b1a84d40a8364a3386c104cd/89242898556.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/jowuluweripujitaduwowuvo.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/tijobojarivefikisope.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/92878589764.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/tuvuropa.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070a64af0d88---katotibogoma.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/52453777e278ee03775c12b773a824f1/14955399154.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/32400686071.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/29329749413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=active+voice+to+passive+voice+converter+onlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A01 18864 bytes
SHA-256: 962476241a63415dbeed03ac802e42175613362a8fb9d816be04c93f3c400470
font_02_sfnt_off00014ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADA 10412 bytes
SHA-256: 8db21957750de73ba18d4771a09639506b9e80e006502c2115ffef8369711c42
font_03_sfnt_off000162a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A3 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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