Malicious PDF — malware analysis report

Static analysis result for SHA-256 6635a70df1bc780f…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 21:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e463f9a2223fba52c203a4e0c01f5e1 SHA-1: ec8a28399770b8321d260409f0b75dcc5625b700 SHA-256: 6635a70df1bc780f1d6713a3919f5191d30c21199f26ac0d6c482d7b90f74a37
164 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, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a 'download' button lure further supports this. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164d158de6---kutafosesab.pdf In PDF document text
    • http://3gr-group.com/ci/userfiles/files/26502141780.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/48578883608.pdfIn PDF document text
    • https://polytex.de/sites/default/files/96594928002.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/51689493520.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qcuov5t0cs53pnqnmluqomk5v8/59871700793.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/noxitibiwupas.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202191219658.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/69195260030.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/virob.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/pusofixerotoxowigoniwedid.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/42099508224.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/6924449721.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f433491704---lejaxavawujajawose.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/48a52a53f68d4f5f6327bad17090f74f/liwuwe.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/tejimaluwosazotonukovebi.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/wezitope.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/petitomiwuziwajadewiromo.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135c89c63e48---tuxikaj.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/zimoba.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///luzovapoveligudiwivax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fake+gps+locatorPDF 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_off0000e7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 17720 bytes
SHA-256: 3bf4b56197e070da873978411820d61a23adc44909a0210be274d2dc08206c3b
font_01_sfnt_off000115eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E02 10424 bytes
SHA-256: e60b09cb1751fdeebb6eeaac5ecaf2adcc4e3a25f5233cb74ede4118fb3d01ff

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