Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e1ab4a606059e3…

MALICIOUS

PDF

88.9 KB Created: 2021-09-07 21:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30647f5bb1558c4f2dec756fd28c9f09 SHA-1: cd1b239511007f240854926e53d554bbc0e58349 SHA-256: d9e1ab4a606059e3c45eb8a77c3990c1ef165f4e32082b48c5c6f3a4df22cdde
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, consistent with a link farm or phishing lure. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://mahnomenalumni.com/clients/879209/File/bapusujagasadukepokaw.pdf In PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b9be93212---zilivefotonoxekilolekovex.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/31100994666.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3c1100364---foratoruvukuviwa.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210820141301.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/32927665487.pdfIn PDF document text
    • http://tochuchoinghi.org/files/ganaxopegowudonunazu.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/fmef3b1v203g925skiv9hrtcku/39234457406.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/83668583966.pdfIn PDF document text
    • http://e-hematologica.com/users//file/85623847667.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b89b0c68e6c46ae1a018f6a44ebeba7f/ropeniwibonula.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/fc39532fb5968f2e9b21fac1c00cda73/sapemoguzanabo.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/wovewatel.pdfIn PDF document text
    • https://carlojans.com/cms/file/romoxutat.pdfIn PDF document text
    • https://webmenuplus.com/images/file/tunasunobotuji.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d789357d52---36786470034.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210730071417.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/xebudovi.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/bbc4e194f5f96ff692ba7dbdd763ac2b/71786195266.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607231ced186a---87997546887.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/gopomerijobekobedof.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/0ccf6b9f390bc9eb991bc604457fc623.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/mojesomavamexisukitalef.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/80738739146.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/jaxakelevubexur.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/6a009715c25085d0d6107b187cdb36c9/54833605032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=9+stages+of+family+life+cycle+pdfPDF 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_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4A 10944 bytes
SHA-256: fcda85cb8aacb92759baafa1c393ec297c4d0d5fc9e464aff44b263672e1ca94
font_02_sfnt_off00012779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12779 18000 bytes
SHA-256: 475d9d4e3fb0c3bd4dbebc636feffbdeb3036d515f5befd1309e9f9f0fba6831

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