Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d6cc97c5cdb521…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 20:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc4a5d7241add4bdba5ae3a76c3d459e SHA-1: 9eb5e6dcb88ddfded0ef62ce3c44dae74b2ed408 SHA-256: 64d6cc97c5cdb521e3d2e31776f170a78a27a0a805eb1db7eefc4b99b6e16848
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://tafgambiatours.com/userfiles/file/dozikojaj.pdf In PDF document text
    • http://i-harmonics.com/upload/files/zeletinidiwarine.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/gixiderisip.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210902_50A304B3704C739B.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/lelefulev.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/55847784670.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3e23bd2701b28b4eb529169eacf17eea/15705986019.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/90009277461.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/94ab758489612fde313189e86de3012b/togojabowed.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/nebinikoxikaf.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/41527304804.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/vamiribesagevo.pdfIn PDF document text
    • http://wwstationery.com/files/file/kunagivop.pdfIn PDF document text
    • https://dhesient.com/media/36311731541.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/79450174695.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/boweduvovofiperisisemo.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8d8b88152f5540c3300ca72c08bfa945/gupozogov.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5f5b5c6b63fb5efe386d738998ba02bf/94194181286.pdfIn PDF document text
    • http://electroagro.es/pub/files/tumisafenobujep.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd3d139ec---87679740622.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/figisunedujalowepi.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/zipuxomitumosozizop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+game+naruto+x+boruto+ninja+voltage+apkPDF 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_off0000e0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AC 19120 bytes
SHA-256: 609cff57a15ede47d878a3e92c4f8cb77cbc436de8dbdf82e6ea0297dd6d7b22
font_01_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A62 11284 bytes
SHA-256: e8237d6d17ac0a773b0af1d4703807f938427a707838540765949dbacb45211e