Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca8b5555787bdcb…

MALICIOUS

PDF

75.4 KB Created: 2021-09-22 20:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2a81826a6221f5c3a8964526911179e SHA-1: eac46df210d79e072cc6656be069a55efac5623e SHA-256: 8ca8b5555787bdcb91c41b6f0593bbca80c0b8b9309f42ede4e7cf984d21af7d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vagtteam.com/userfiles/Files/25967225239.pdf
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/jugeg.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/67h5atkgt13759563d467ps3dl/duzonuxesanixajufoparuku.pdf
    • http://cdkuysuujk.handysociality.com/upload/files/58546226435.pdf
    • https://3rproject.eu/ckfinder/userfiles/files/jirudisirokatutovimije.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143fccbe5151---18492275081.pdf
    • http://hftyby.com/upload_fck/file/2021-9-14/20210914145211165997.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614a21094731c---ferolebe.pdf
    • http://rainhouse.kr/data/editor/file/1505076418613bb86f1ee65.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/52147138486.pdf
    • http://spokoino.ru/i/upload/files/41304485068.pdf
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/zerukujita.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161373bd0a7fce---sozumulebovokixokuzopo.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9e0ecc6a5cdff2fd8207ecb6a7c95386/69969648686.pdf
    • https://canevastoilestjean.com/upload/editor/file/30188513808.pdf
    • http://cdmvt.cz/sites/default/files/sirajesojuma.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e52bde8b18---dereber.pdf
    • http://ecilingirler.com/resimler/files/natukasubo.pdf
    • http://sendedianqi.com/upload_fck/file/2021-9-4/20210904004722449430.pdf
    • https://synodradomski.pl/userfiles/file/79847986209.pdf
    • https://castilloexterior.es/ckfinder/userfiles/files/26769885232.pdf
    • http://househouse.it/userfiles/files/guxibajegut.pdf
    • https://soechi.com/userfiles/file/watesepo.pdf
    • http://jacsonsfurniture.com/userfiles/file/32283892360.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137675fcde54---18260719477.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sonic+forces+apk+hack
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3a6.bin
17ec5f6bb6b394d65a92c4c2a22b5ae99e493be298c64ab28500c861964eba12
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A6 10600 bytes
font_01_sfnt_off0000dbc2.bin
54333cebf31e1617570e1da6819db9505a309f98040a14a2d8e494ca89dc687c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC2 17056 bytes
font_02_sfnt_off00010826.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 16792 bytes