Malicious PDF — malware analysis report

Static analysis result for SHA-256 09110fdd9498a320…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 01:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45fb1b1495c9a78cc70860e3169c34fd SHA-1: 81706f04a1c666879f19020019c34e6703ad16b4 SHA-256: 09110fdd9498a320b3002e7f900c82ebd230eaf70fda4cb710c89bd3e6917de5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised or disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/f36a51rilrqfd8uqamatbeir00/12091823164.pdf In PDF document text
    • http://camonetinternational.com/files/file/23580064481.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54b42d938---wisasufipazumimo.pdfIn PDF document text
    • http://come2menorca.com/images/file/liwepojebebetox.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0652fb1891bfc07136976f042b1da103/17027634022.pdfIn PDF document text
    • http://sam-global.ch/files/file/ladasudolexexasudobim.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/323243528319db586daaa7d73ffd93e3/64386843185.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/zumawif.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/salas.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/jegudinor.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/fojupud.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/100211492126.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/1561984034.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/86973848088.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/27f8089fa7829f4edc163687f7dfe189/natodebalax.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f048da06ac---rupugul.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/dekivuzawotimedizex.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/binofetibolevazizadarena.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/femekalujoruxokubis.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/tovenukutabakelovogilalan.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e265f17c4dc.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sum+of+two+independent+random+variables+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_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 11128 bytes
SHA-256: ac606c1a4697b48c4f0ffea1feb7a41472640b9c6a2e8e1a789880c487c35e54
font_01_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 18180 bytes
SHA-256: c5f38618fe0c97509864e615ba1de5b13303e546ab2df1abb83250369a80227c
font_02_sfnt_off00011e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1