Malicious PDF — malware analysis report

Static analysis result for SHA-256 db822d287665e679…

MALICIOUS

PDF

71.4 KB Created: 2021-09-21 05:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83c8a2a9f6dffade87312b5332ef7168 SHA-1: ce03e51dd52ebdb895379bf1ed8f3485de1105ae SHA-256: db822d287665e67978ee20bd0b5addd1a19a6db042db98818a37509ad70d0b1d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack pattern involves luring users to external malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://huntic.ru/uplcv?utm_term=perfect+kick+mod+apk
    • https://yunglin.com/uploadpic/files/40263345475.pdf
    • http://transporteslaplata.com/imagenes_web/file/mabimu.pdf
    • http://parcroyale.hk/userfiles/jujekukorakure.pdf
    • http://skupka23.ru/upload/m/50225933995.pdf
    • http://playbabydoll.com/userfiles/file/82848662449.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4d0bef7e241a258efd153666bf544b92/safubetusatezatomiluna.pdf
    • https://natinsel.com/imagenes/file/33393777905.pdf
    • http://annabarons.com/files/files/72798425827.pdf
    • https://tootooair.com/FileData/ckfinder/files/20210914_BC17E7EB144F0AAE.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b18768d600ba89937f4a0993bced4e2f/28466037337.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a98e5221309b2f24e43aff9dd3f6c930/20607004989.pdf
    • http://omegapizza.net/uploads/files/muwopeniwodubu.pdf
    • http://halanmilk.com/upload/files/5381827501.pdf
    • http://fipjp.com/userfiles/file/jujuwi.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/3412820facede0fb56ed7ef2418cfe5d/pawekobomatuk.pdf
    • https://tp-pos.com/uploads/image/files/17357234913.pdf
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/favobotaxubolamomipoxox.pdf
    • https://reviewz.eu/app/webroot/files/userfiles/files/90267489903.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8ada6cc07---69912719895.pdf
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/84464124254.pdf
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/godejizivimozexoruze.pdf
    • http://boothbayharborshipyard.com/userfiles/file/pafibikuzofiw.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/gakiliji.pdf
    • https://vjlabor.pitscovn.com/uploads/Upload/files/mexunekofemalitixokug.pdf
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/44809919972.pdf
    • https://elitstroycraft.ru/source/file/sobafo.pdf
    • 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_off0000b60e.bin
11ec5de5813aa7369fee60357b4a83c9d84eb272a581f86faf0ef7c7eb274e2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB60E 16328 bytes
font_01_sfnt_off0000df8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 16792 bytes
font_02_sfnt_off0000f7a5.bin
1c1b7fad7bd5e8a78504e214626f48afe0449a40dc10986eb11ce6b1fa819435
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 10556 bytes