Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e0cfd8a7c152701…

MALICIOUS

PDF

78.0 KB Created: 2021-06-25 21:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88e376329f0ad1f7dbd6afe3ab1b6dc0 SHA-1: 93ae2dda3b9ea52f7e1663ca8dc5f005f3086e34 SHA-256: 3e0cfd8a7c152701d9c7630a911b1da3678038119c824246137607a6ea9c19fb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://solener.info/ckfinder/userfiles/files/3929161829.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1056ea918---funadarirowe.pdf
    • http://anandamsanyal.com/userfiles/file/70772343475.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607053fd1446c---gopokunalolu.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8ouja65rhe4lfqo1449kf0b7v3/88062676435.pdf
    • https://nestsearch.in/admin/uploads/file/rebumuguvijuvin.pdf
    • http://kppzp.pl/userfiles/file/gexutakogufo.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/272ef3ce7d9d73251da8b9863071dd7e/66679035111.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ddb23ba570caf821c37f87fb7d04e551/10821960933.pdf
    • https://matrainagycsalados.hu/userfiles/file/82312490682.pdf
    • https://iohrp.org/f_files/files/39187820818.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/d82b44e00757015e432a6da35d4c6e5b/pedolejetuxiwito.pdf
    • https://euroroma-bg.org/files/file/2536032621.pdf
    • http://studiolaviano.it/userfiles/files/mipotesus.pdf
    • https://honghow.com/ckfinder/userfiles/files/tegesojapobexifer.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160862096120ee---86362933564.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/39777d5cb12f690d9389b2e13810cd6a/73402177462.pdf
    • http://studiorinaldibedin.eu/userfiles/files/widoropi.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b18e8223e160a7389456e89688e01e6b/19559149461.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/litejiwipexozer.pdf
    • https://acavacecio.it/userfiles/files/80611260862.pdf
    • http://lapenya.cat/imgjovesnaves/file/fanakopozibazemazixofezow.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=wi+38+human+lung+fibroblasts
    • 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_off0000caf7.bin
7cf77d30ebc124b228ae573ef53f7627164631e98f0a2aa51744c509d2b5df86
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF7 17144 bytes
font_01_sfnt_off0000f7b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 16792 bytes
font_02_sfnt_off00010fce.bin
49ed646c0c708d6fe56d1c34fcb3b1df4668e95fe630f092e992236eb4433940
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 11140 bytes