Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c9980cf75f16d9…

MALICIOUS

PDF

80.3 KB Created: 2021-07-18 06:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42c79a0e7193089f3a8cd026f5ca44d9 SHA-1: b1ea67cae82866426980bf441b960d78e0654e27 SHA-256: 24c9980cf75f16d9addcc81d79db2ee90bec43dadb523b8f2dabcd7e2693373a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The presence of link farms on disposable hosting and compromised CMS uploads suggests a tactic to obscure the ultimate destination and leverage existing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4e51c6e1---guforinidozupexipupalewi.pdf In PDF document text
    • https://etimes.mn/uploads/files/58273064672.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/bugigelezo.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/42876896388.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b64849b20a3---81822918409.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/64082602495.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/24268794955.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea0853c98d---74782131865.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/karujom.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c896c74dc69---19053310163.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ds3rflsfe04vsc3a6e5h7kvem3/97181810079.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bd24c5239---wakoxogukiliti.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///17139339296.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d983b150c0---69115352428.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/34178955602.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ms6kuqpvdp76m3o3p1tqjqnqdu/valagirulatewisabofenono.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaab3c59f7.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/vedodamesenejavi.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/20692440284.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/86498198254.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/86393001420.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/rabixupunonesit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=free+kcse+past+papers+and+marking+schemesPDF 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_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 16120 bytes
SHA-256: a3cd157ea8c15b882cc45ad4d4ee7b3e9bf268d69ce795bf9965c2235cc57031
font_01_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 10864 bytes
SHA-256: cad196333d6474abe57e72f58cc641cc0d90c7900288d703c6bbdf3c1d049dc5
font_02_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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