Malicious PDF — malware analysis report

Static analysis result for SHA-256 910878a53360eb8c…

MALICIOUS

PDF

98.6 KB Created: 2021-09-01 15:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c631a220a1bb91adbd8427c80cfbf3cc SHA-1: cbc16e7705d0744b2e710c459aea466a6be70b57 SHA-256: 910878a53360eb8c0e55fa630568303fcf31817fbd8e06a7d09237abdd08070a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://learningsolution.ca/userfiles/files/kedozufilesosekojoje.pdf In PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210503011734.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/fapajaramazuzanozomude.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/vafesin.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/jumefo.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/wifogati.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/7035215575.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/xabelixulafakanut.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/80113ca00ea774977253652408e5564a/jasurogujukiwiniw.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/1658fvdck3fq37n15an7pvino6/dolowibawunonuzebedaguso.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/d29ff8b0675c229dddd18efa03fdedf9/pepopiruliridelugaren.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef7106bacf---14816044458.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1770d451de2ea9abb32db97fffed2764/tulake.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/8052186595.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6138b2d76c59fa8cca28cfd1319424f/kipamer.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/fezedomazunejel.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a29caf437---ledalozoloso.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/26acd1191b6d9b3284b7e3d6395130b0/69329105433.pdfIn PDF document text
    • http://soupworld.de/upload/file/seniliwedalilebidavijijow.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/puwulexe.pdfIn PDF document text
    • http://grabnerestriche.at/wituzesa.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a327de707---fuzewibudonuga.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/58820901517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=s+chand+solution+class+9+physicsPDF 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_off00011b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 18504 bytes
SHA-256: ef5aafbd1ea9097b5e08c647bf670ed80b04d586d3d6895cdba4c9784df04836
font_01_sfnt_off00014bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D4 10836 bytes
SHA-256: fd65a22c9e18dce0203b6df26af1a3adf87199f2c6389610e85115c3e171aea2

Open this report in the interactive analyzer, or submit your own file for analysis.