Malicious PDF — malware analysis report

Static analysis result for SHA-256 9858dcbaa619eab1…

MALICIOUS

PDF

76.6 KB Created: 2021-09-15 15:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f58ae127c19e30486f6775da5f12b049 SHA-1: 149f82600439adba461371dfe630c91ff07ecc45 SHA-256: 9858dcbaa619eab11e98a2a1f5b5a070c26cb789a1875250c7e08fc20911bb91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aluminial.pnh.pt/js/ckfinder/userfiles/files/dazinuvi.pdf In PDF document text
    • http://jjc-dev.com/userfiles/file/povadedamogi.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d78ab934682de42f30a89777bebf2429/gizozodaj.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/48fdc7ce4184abdffe349056af4b6dbe/posotejonorijelovukulanom.pdfIn PDF document text
    • http://hejia-ele.net/upload/zesukonagelanupam.pdfIn PDF document text
    • http://dezis.ru/uploads/files/dupoxud.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/dojawopabibenot.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/78794819630.pdfIn PDF document text
    • http://guitarenko.fr/img/files/kajowaxosiwiwilel.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/65929445531.pdfIn PDF document text
    • https://tepihtrava.rs/files/31091419864.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/88873612470.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/40740177256.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/83650150780.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9ae4ea3a2---binasodividipewidix.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133064028166---zumozobumapeka.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-7/20210907041331808974.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79cccd2c2cbb2c44003372f08970cc47/xadizewifowerozafim.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/jemodedisezibepuvozovunu.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/pirolurujorij.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/31880405972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=libaas+song+download+pagalworld+mp4PDF 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_off0000c6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A2 17608 bytes
SHA-256: 3f77ae6712f315d57c98a5767b37d1e61fc62e798cfa275e73f6faf6ca3ea0be
font_01_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 10764 bytes
SHA-256: 17cfb3e4c8e6938ffc7f8e416c7c41d11e5ac671953aedfc283bd2f08be22942
font_02_sfnt_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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