Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc981309653f331…

MALICIOUS

PDF

86.1 KB Created: 2021-07-19 12:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e8e0696382d4bc40cbc3495782026a5 SHA-1: ac11a04d127186a2956432589e7bed2b582dd89d SHA-256: 7cc981309653f331e00e2903da1bc3ecc52d6bd2084ee954b5bdf970429aa8af
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and a machine learning classifier, with high-severity heuristics indicating it is a payment redirection lure and contains a link farm on compromised CMS uploads. The document body is heavily obfuscated, but the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing attempt to redirect users to malicious sites for financial gain. No scripts were extracted, but the PDF structure and URL findings are sufficient to infer malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://upbfassadenbau.com/upload/file/66617829918.pdf In PDF document text
    • https://argumentua.com/i/file/93391199835.pdfIn PDF document text
    • http://goref.ru/files/file/tedixaxowujutiju.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b632753f8---32471331764.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/visagerugojir.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/jimilo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xulovuz.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/45213882949.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/39346873706.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/qutac205hq76f505fp4vf3i0qp/74481079965.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/1578538418.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08520c8b85---tuzamoxenuz.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/lupegox.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79961c830---39817700827.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/9d8d4a10672f00e6181403ca66feffac/lisaru.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/67157666983.pdfIn PDF document text
    • http://vswet.ru/f/21548435936.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/6e1afe3f8d675cbba7e1e24919f9feb9/36887146056.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/2oo8m5cc4isj4q0eno23hd362v/nigutodeziso.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ujd8b3f8e4essaoketa0p9rs8f/jasetofew.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a028bd1c582---bojokavaxipiguwakika.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a7800673---jujatovo.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/xagatinololewibulewev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=media+planning+and+scheduling+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_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 10676 bytes
SHA-256: 11fc028739d61238c42c2af3254f28ec8474c028ff783fc9d1dffed52fe6fe58
font_01_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 16784 bytes
SHA-256: 4e4ff7e6701f32bf3196c3301e1f8e20100065767b45e5bc958aafd01c3e5f6e
font_02_sfnt_off000132bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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