Malicious PDF — malware analysis report

Static analysis result for SHA-256 6410fc9fcde35398…

MALICIOUS

PDF

85.1 KB Created: 2021-07-19 19:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dbeec061cf3aa774ed4b31897d9357f5 SHA-1: 32689c25d9fb11d86f55f39597b13abd62117fe1 SHA-256: 6410fc9fcde3539847491e4cf5e830a4326642d84fb707c98b812ad827919781
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination and potentially distribute phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab48c35d5bf---pagakisakogelivubepubawi.pdf In PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a79c79ea765---13861758202.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/gekikezofalonotok.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/89672687154.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e0815b659---nosikidi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2881143771---11564676186.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a471f11a0---koxogaz.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9c12f43a776f3f4e529498e42bd18123/nevenafef.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/rj8a4stpsts18apr5prhq9uee6/30378966008.pdfIn PDF document text
    • https://exxontel.com/file/dudolotedelero.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/57601068843.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/28972805902.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4f163cdb---tirekitibamul.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ba3c24950---zabifonuxakegilimowosumul.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/58124327675.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/tidajibofodetipev.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/6967108082.pdfIn PDF document text
    • http://sowitech.vn/upload/files/13008776884.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/40232168467.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/f1364d8889c1c8c55cf94cbc08e90b55/213870089.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/lojojajavumojod.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jagifefom.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/mabowiritokowejumaj.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/86047396002.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/94206304232.pdfIn PDF document text
    • http://markone-tools.com/upload/files/74117076802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=famous+hot+dogsPDF 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_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 16712 bytes
SHA-256: b9b7a7ffcc4cdcbad1f8af51b59926103e4f732b552a684771673dcff2dee278
font_01_sfnt_off00011820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13037 10300 bytes
SHA-256: f42ab96f3206f48146c3744e823e126d8e4056ab8983a92f313687e55a3238c8