Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0908f074e1f903…

MALICIOUS

PDF

81.3 KB Created: 2021-08-18 07:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c1ba699b77e54e2d1a5b5aac4429c515 SHA-1: ac4bfa8ab0c9f0e570dec1e10121f272a7567b46 SHA-256: 3a0908f074e1f9031e165e7cc7eff0a0c03adea22abffcf83a51c5826ea608bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://krisoc.ru/uplcv?utm_term=fahrenheit+451+part+2+quiz+answers PDF link annotation
    • https://badrivishal.com/media/kedilatabaxapofa.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/86716807773.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a745fe13bb825216391a1a6362e5f3d9/7729387215.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/24104825272.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/65119172504.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/motobixijuzojipavipiba.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/94453e2aad13999dddabf61b200bc4d4/zoguxivemu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa417575985---vunafewufuwuwavovezofa.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da44a97f32b---befidutumezezare.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/3aa9hn4noje3nj13q6o2dt2clu/36901821180.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/visotenowizigiji.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/selutebo.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/e1901fbb8b46132957ea68632b11d8d9/5213694219.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/venitukiwa.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/52602706860.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/xegozewisesebusi.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/kunedaropifibapus.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/34928c7281a2e1b6842621aad69c6607/xirajulobom.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/43767244481.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/582ea4c350ab353aab37ef3e248d4d28/denidaziz.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d3d66012425431f1f252f0045c8733f/13483961793.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/fibisanago.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5617d2d15e910227a3c8f7b8a29793a3/22095693086.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/dm2bpa0pcgket0ksj3cqop8m9a/69930927956.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/vanadosufaxife.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_off0000d792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 10936 bytes
SHA-256: 7dc8bd8a1dafa99253052fdc7c698bbedfb7c709c4e57050f6339c621910368e
font_01_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 17940 bytes
SHA-256: a0f2edbccd8d4f5b96e161950c4e66253b3ff793f4f4e7c055875a1d34f8e19d

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