Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bb420281175aa0…

MALICIOUS

PDF

85.0 KB Created: 2021-08-25 13:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b27fd3f836500f8ddc093081be2732b1 SHA-1: b258f9e72153e81e5f4822891613815a0dfb723e SHA-256: c8bb420281175aa0a7cbacbfe7b47b1d68b390dc0dda92700e5b28184a0192db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous external URIs and link farms hosted on potentially compromised or disposable domains, suggesting it is designed to redirect users to malicious sites. The presence of a 'download button' heuristic further supports the idea that the document is a lure for downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=whose+line+is+it+anyway+games+pdf PDF link annotation
    • http://hzbmsj.net/images/upload/File/68813994936.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/13ac3091bb42957cbf83f9be34200f05/61911379264.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210718_112354.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/72044779153.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/67387720589.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/93073050041.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087f9725efb6---83916402570.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/89057695084.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/22937453160.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5fb05d7f8---famadafam.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff1f847dbf3---ziperovuwidivefikiwutusob.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/8439456426.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/lumowarezifetosekugi.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/66035974251.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1837caaefb19800e833e83e4a3d0f9fd/45527977731.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073796b6179f---80416882767.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a4e907b6fd3e8febc2d292d37644f7de/27196272165.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/susesanikuva.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/henip2vukf8f05slulfie9riqp/10901797927.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/fvt3a2iajuv1pgkv7oe4oc8n54/xogalegavasozum.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/r99k3hprcfefe40ftj3mt4kbf0/14712865089.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f9bc6c9a270---47589896373.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/3aca02de5a2708b9b0c1199fc8513b9b/bejemugozit.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/tadipero.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_off0000e589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 17288 bytes
SHA-256: 47a2111581d6a2e2a6bac32d1e0e52b94d43cef7fe8ffc15722b54a24690075f
font_01_sfnt_off000112df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DF 11036 bytes
SHA-256: ee8e7e24a43edd333ebb6b9149dfbe494669f579ae3d3f5a5080ac800b128ee5
font_02_sfnt_off00012c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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