Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff57e23d30be6e4…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 08:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d95f4c8fd6f88b8012e342fc62e4e36 SHA-1: c1f6e58c3606053eb2f90ae80b0b04dae4de0026 SHA-256: 0ff57e23d30be6e413578caf99bf21cf9a942799e9da7ed5623753402baefb2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised content management systems or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the presence of a link farm suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=watch+deadpool+2+super+duper+cut+online+free PDF link annotation
    • https://sailstudy.in/ckfinder/userfiles/files/18139359191.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138917cc6f81---jikanadupiki.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/79731233025.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/86071986562.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/nagulakixezexesa.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/rotorevat.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/72220820443.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/tutowulopibevowifodok.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109162229011576.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/mldm77smhi31871ih4p1s24ng4/95420829203.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/sajotunoveteduluvixisuma.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/xasamijawipano.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/lofikejumagonibopezefe.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/90451373409.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/regovowipudazogifezid.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/xetebufiliv.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210916120246.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/22015666798.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/99940896857.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/25805432259.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/82140631192.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/6d6ba02ca87dc30d04f35a1c2342d0d3/79497724410.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/64763116220.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/jagaxedotepolaj.pdfIn PDF document text
    • http://ktcz.eu/files/files/62363736826.pdfIn PDF document text
    • 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_off0000df92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 19308 bytes
SHA-256: 0d994cddab9453da24ff1f08db9bbc6323ec14198f89434969d9d7421c9380ac
font_01_sfnt_off0001122b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A42 10928 bytes
SHA-256: 2713a3349acea6a2ac72e92e6dbe698afce86da6c93672acfec5f09352e2a451