Malicious PDF — malware analysis report

Static analysis result for SHA-256 38649de9e2e24dc2…

MALICIOUS

PDF

178.2 KB Created: 2021-07-01 23:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bd67d17891878e98e2f7ceca27fdeb29 SHA-1: 22920b8b524ce69decef74c4dc03084e089b2776 SHA-256: 38649de9e2e24dc28bfe6072855312fdd74431ca75943b6dfc9d54386807909b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://synerhu.ru/uplcv?utm_term=district+line+timetable PDF link annotation
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6c2393d6---96424817096.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/bologiz.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6fa79c10dde09dd7133c5a46f2fda80/38451413341.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4bd9c8a325e9725bdd6056cae62bd655/48785753163.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a0574d2b911fe39bfc26109d4212d219/fiwewubeleborozubata.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/14957154c877c5bd0c35e5a34dfb9308/99305479877.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c34b42cb9---60941848434.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160893333ee804---7517422596.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed307969d---9915091010.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608618f8d3f84---39004159333.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/79575479726.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/jatokafelapoleku.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0a9ca40b6aba20c9a0b3ef5ab84e8948/gesibilenokezamipugaxo.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/wojuwodupusefat.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78869986320.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e93e33394057f242ebbd036c031a59b3/67712663373.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36cd8cfd66---94186101078.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/b8199fa42a44d85442ea973bb5332b3f/dejaxoweloxujisunerame.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/52302960632.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/mami48bnhfivnbk9reikkgcu5d/vopusojumuvubire.pdfIn PDF document text
    • https://davaocarrental.com/images/file/nudirozajaboforafujegute.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607458c862fd8---zulitimumok.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c331e9a69---kozofej.pdfIn PDF document text
    • 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_off00025dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25DAC 10412 bytes
SHA-256: 61a33c03d2def46c4812090b4580ac4a138c851e6099f578baa46fb37dd19b41
font_01_sfnt_off00027543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00028d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28D55 17388 bytes
SHA-256: 4ac87db41d7ac24e9a06f4900c4442c3beacd30d5233e359097d6ebedbe55cc5

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