Malicious PDF — malware analysis report

Static analysis result for SHA-256 82520ed8da6f607d…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 07:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de1d9d3b22d13f8b74f7dc54ad0fd4f9 SHA-1: 3acd382fdb1534b6dac2cdac5652ce4a621884e9 SHA-256: 82520ed8da6f607de4bc1fa9d1bb5034931ce353abfb6a15fec2722c41fe6c43
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate that this document is designed to act as a link farm. The ML classifier and ClamAV detection further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://nomylo.ru/uplcv?utm_term=harry+potter+hogwarts+mystery+apk+mod+android PDF link annotation
    • http://capthepcongtrinh.com/uploads/news/files/51431733754.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/keladumizalebu.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210904_14B1930F766F8A3C.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/13925499604.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/68485311656.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/29693860185.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/70376115184.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/joxak.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140d4c3e8e6f---zalekulagudikoxuki.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/kosafedurugeji.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614661adbb1a4---73051273172.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/53453352279.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/21141693860.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/bebokuporikomajed.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/48942356758.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/76262551774.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/25949831870.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/uqjio8q6sukafs61fe22vausq4/dubasanunavumigu.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/54474702353.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/tesorolo.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7n5mtdshbu2vra23c9o6kch0ov/78016949519.pdfIn PDF document text
    • http://gysanya.com/upload/file/210902173736155517dd5o6cxd4pze.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/3186213674.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/rapikuvukesati.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/rewazujomuxenariforo.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/96442346492.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d33697e303e0f9667acf827367221f96/kovuze.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_off0000b6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DD 11076 bytes
SHA-256: 2176afbbb6c056f5a9703d9158e630d67a1a06e10d20a617fb4e6e28a01fba45
font_01_sfnt_off0000d05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 15300 bytes
SHA-256: 58ac8ca1b24b8c69b7fb034659dd03ca2b023ec021e81d9d7b67590db1657e9c