Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f4114495e9ae10…

MALICIOUS

PDF

140.2 KB Created: 2021-07-19 06:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ea22f316de8b30c6f5c77e3b2f3982bf SHA-1: ebd326585c09613399d335bd8a0ae7b7613286eb SHA-256: b7f4114495e9ae107f68ae9c8d7e5d83bd6cad508f7a713487f052dbf2b3681f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites and disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://congtyvima.com/images/Download/koxosizana.pdf In PDF document text
    • http://crm333.com/documentos/file/6228118245.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/50409998915.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/39d88d805cc3111eb0584e181dfa34e7/33904601875.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/pd2r3uvj0ej4rme49m2qv270ie/gebukazunelevanimis.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16099c23baefce---38383352890.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/71150249807.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc0697e222---46779414353.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/dufepelugaburuwakisijixam.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed35e266f9---33136641179.pdfIn PDF document text
    • http://juentai.com/userfiles/files/liramoxeru.pdfIn PDF document text
    • https://virker-ikke.dk/files/223837608.pdfIn PDF document text
    • http://sgpeo.pl/users//file/35736861308.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964c3672660---48055202669.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/bba9dad0a6fe4235ca5586c63e93acfb/tenamukidagidemenig.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6cc2e9ef2a08c8c3d7cb4079a073bc76/53588931071.pdfIn PDF document text
    • http://asustainable.com/global/file/17735005423.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/rizizigipanapaxim.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/886321c789d6c8bef4476fe3b536ce8f/puvisotemumojotivorunuk.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c57a2105f0c---44592744586.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a650c68ae---51381158802.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/61534562407.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/viroxivagutapuvojulot.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/mafujizivetafixewimun.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210708151355_5r6uw2.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=riga+latvia+which+countryPDF 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_off0001ad45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD45 10620 bytes
SHA-256: 94010d7890252f406df6f65b836e0f5cf533ba87f02e6097ebb7a6c115d00b74
font_01_sfnt_off0001c592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C592 27988 bytes
SHA-256: 76cdaf9219094e350541fcbfc5ebfdb58b75e080438afbe19771d7ac6965a34e
font_02_sfnt_off0002099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2099E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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