Malicious PDF — malware analysis report

Static analysis result for SHA-256 989def702e60941b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-12 11:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 481066a87c55866c2938f1a57065eea4 SHA-1: 4dbdf52f4b5b5a8665b16dc34ec47bc110a099ef SHA-256: 989def702e60941b68774eaf6f3c53f4eed6109dc7a04223651b937b8d60f1f1
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF is a link farm hosted on compromised or disposable domains, designed to redirect users to malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of deceptive linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/jarurasareluwajagonafi.pdf In PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bgm876oc1simv4ile8prmbbuvk/nedelokojufujix.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/23798914504.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/82295024094.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/dujilixesirulizavagas.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/77362198068.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/jisaximepemonoboja.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/waviw.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/34635516844.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/47164845120.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a920712ae29bd1ad9f6434b66527ad4f/91039643248.pdfIn PDF document text
    • http://innotack.com/userfiles/files/20381658141.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d7e684c68299428f5ba27f6feefd7dec/puxaf.pdfIn PDF document text
    • http://haki.vn/uploads/files/2208344174.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/kisigosigemifif.pdfIn PDF document text
    • http://proart.by/media/file/labuponituk.pdfIn PDF document text
    • https://dhesient.com/media/66091271339.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/zufuxapivulozakolemap.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/daxekokawakutevig.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/basavulak.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/fewofi.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/lonom.pdfIn PDF document text
    • http://hiniceshine.com/upload/repeloreselogedisirela.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/fagenisagawuk.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/ruxud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=james+huheey+inorganic+chemistry+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_off0000d19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 11228 bytes
SHA-256: 984a038372ac8e735e427cb68b9d55fdf1cf6b50f262a8b798cedbfcf9d59c19
font_02_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 17496 bytes
SHA-256: 2971d66ae7346cd9f591728a1293b11a7b50bec98eec9d54d9f6f31caa57d2c0