Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd270fad81e4cda9…

MALICIOUS

PDF

74.9 KB Created: 2021-09-10 12:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5cde09d374f5488e330911c4f62f2749 SHA-1: cc46af04b360e29bc83c08504f58b8b49d6d34c6 SHA-256: dd270fad81e4cda910d9decdd81bc1bdf2d0152c6449735653f9b67c61bd7123
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links to potentially untrusted sources suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ukmriptek.org/codeIgniter-hmvc/userfiles/files/30379896165.pdf In PDF document text
    • https://foundryindia.org/userfiles/file/sakolaboluzadisa.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/12222089764.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909135253568142.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/m6akef1mls3p4b0toc235sfg3h/24838825048.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/8062375284.pdfIn PDF document text
    • http://domario.ru/userfiles/file/18669714789.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/8816631240.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/9639690177.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210907001553.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/9a961843560d5c432f31d044e4c73324/34122820601.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/74653911944.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f7039e868---64530740954.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/sakemoxitegibu.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/vozik.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/xisimotimewim.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/vefubugudaliwuz.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/31615379151.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/basidobawuseni.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109082129592682.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/sulet.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210902054907_1923950402.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/tozumozi.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613904f94bc1b---52743993938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=given+anime+movie+full+movie+eng+subPDF 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_off0000b95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95E 19796 bytes
SHA-256: 1de506315397112b8ead8f403616face56a09eda0d355ced008b090f8e084871
font_01_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 10704 bytes
SHA-256: d9236d8c87953dea5e1de906949e7827b3dd241e55e71067951530c2fabb494d