Malicious PDF — malware analysis report

Static analysis result for SHA-256 919b996f2c62b9e0…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 05:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50206d25f71a56ae49ab366982798489 SHA-1: 7f412b202f8e1498b0398825ffe6fe3c48c7bc5f SHA-256: 919b996f2c62b9e010885698ebcc8fb68752bf8b0c7e865e470931c7e0a74db8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://bakoca.hu/files/file/rijozepoxof.pdf In PDF document text
    • https://ratosatu.com/contents/files/93016395985.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/sadite.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/xefaxusuribovu.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090421035173499.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404344d3b43---38316144876.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/luvorowefanafilonuguwolax.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/85253985904.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/kejajerotumuzeta.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/61429352551.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109032222172542.pdfIn PDF document text
    • https://paintingwithapassion.com/nbloom/fckuploads/file/gebamagesegowokikawebaso.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/38557516344.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/sinuj.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/28642923786.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/mosetasazawovikuzebulazat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613750b0e7628---89736573839.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/dixanujilava.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/93dni3ocvvklt8dnfed1pi1f6p/kitorovitafulefofarogugi.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/lugelosipefolegujide.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/47427474476.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/6394900201.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/kemokemowenerala.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/gujusodovajulezubirufixi.pdfIn PDF document text
    • http://youil.org/userData/board/file/pemibuv.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/neteretabusevijefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=heroes+legend+idle+rpg+mod+apkPDF 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_off0000d459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD459 17420 bytes
SHA-256: c101b8d827eb2cc8da2fcd659ffafb3b52a1779decca2da43270873bf9dcf042
font_01_sfnt_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 10720 bytes
SHA-256: 513b3bc02c81b4153805022eb2b6273e09e497cd20030f027657ddff31228069