Malicious PDF — malware analysis report

Static analysis result for SHA-256 9657bbebf80ba5af…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 10:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75bd8edb3468993bd9f85d38bd0e78fb SHA-1: 10504b47d4f9977735968c3d8249fcd992837917 SHA-256: 9657bbebf80ba5af831226ae4a89394d9ce382bcb5af91cb55c0481fca036c05
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm characteristics suggests the primary goal is to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=free+psp+emulator PDF link annotation
    • http://studiotecnicopetrillo.eu/userfiles/files/61060601836.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/dosepadiv.pdfIn PDF document text
    • https://mimpidia.com/contents/files/fevanezivupek.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210923_034737.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/77725320158.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42625146046.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/duvifekubanupejudodidivaf.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/vituzul.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/jixujisekiz.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/sotoluxilutefev.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/medujofejoboraxunabokikij.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/28127935993.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/71080269924.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/loxarezuputev.pdfIn PDF document text
    • https://hoppe.dk/files/63106231342.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/54409589702.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/3690558860.pdfIn PDF document text
    • http://dezis.ru/uploads/files/fasujamuseletiw.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/jenaxupekaj.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/63323757419.pdfIn PDF document text
    • https://clove7.com/userfiles/file/jujadegazemowibeval.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613685675a931---896808813.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/2b6a6e04976b40b834f8dda7437af561/25004173181.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/3vmelmrc4iho3v17burlnh2m5t/38651681963.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_off0000b02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC844 10292 bytes
SHA-256: d26ad538a32d2c74ee5c2b82c4a150d0f35537afc279a6d5661c4990cec72fcf
font_02_sfnt_off0000df7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 15932 bytes
SHA-256: fe06b039f193b8f08f4998d7f91a9ebb34d3632a6cfeee19d013d849e6c1bbc7