Malicious PDF — malware analysis report

Static analysis result for SHA-256 984f4b4bc51209e3…

MALICIOUS

PDF

81.8 KB Created: 2021-08-01 02:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3777ee5427cccc72fcc2ef4462751b7b SHA-1: 7588f72c5f2c4df9ed21f125a550ce3fe08ce777 SHA-256: 984f4b4bc51209e311e0bd2a45f7e058647dc5235ce4427815a3ce8a3a5782b3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/f194fb172d020a41c8b463a51f053e6d/xularabujerofaxarudewa.pdf In PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bcc4880c7---46332988911.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/d1ldtcntesk0soei3cmcmje506/26316575243.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/11238133831.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92abbc5dbb---rajokodowe.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/82262424848.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e0ad4717a291b90fbfa54744a39441bb/tifibekizogitamegixa.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/897393b48dec577aaa36acf5e2495848/63637135955.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16087e305128b3---kanuk.pdfIn PDF document text
    • http://temple.mo/userfiles/file/gudivojesovabuzepebirate.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/xonufunisexosidori.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/26335230197.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/gezeziruvutul.pdfIn PDF document text
    • https://mauspro.net/upload/files/85717905219.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/xiwigisu.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210705032232_gc98pz.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9a6dc7aa---94555604235.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160781bdbb8997---bineg.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/bevewivipalidin.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/44579178666.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/bapevafolitisepogovuvo.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/ripusakesifevezapekun.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/tbnj4l9ivnit7i162l90s145f3/wejiduzivoxoneli.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/julok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+much+does+a+millwright+make+in+canadaPDF 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_off0000d6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A9 11088 bytes
SHA-256: 6d60721eb171bbe42a0bc7208887a24af269c18e50d4e486396a6e573ebff0fe
font_01_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 18536 bytes
SHA-256: 0fb795d4fe7204801984dd584d5da5dbebc91a9a7852accb655d71be923679a8
font_02_sfnt_off0001207d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1