Malicious PDF — malware analysis report

Static analysis result for SHA-256 4546d1326662fc8c…

MALICIOUS

PDF

76.9 KB Created: 2021-09-12 19:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e90c449e2792c0afd6de37a916292aa SHA-1: 3aeab73c38ac6782a14b35b2779db22690fe63ac SHA-256: 4546d1326662fc8c698e5ea05ddb35a61681cf7d92e4fb2f4eb847f89ab2849a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://coretry.ru/uplcv?utm_term=the+golden+dawn+pdf
    • http://hlqh.net/userfiles/file/20210911025507_1034102331.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/sobowegopimegeloda.pdf
    • https://mimzyonline.com/userfiles/file/xaxizuwarokoxekesuwolu.pdf
    • http://prinsart.ro/uploads/files/roginonugukenabuxebes.pdf
    • http://studiomarcheluzzo.it/userfiles/files/liwos.pdf
    • http://mh-gartengestaltung.de/userfiles/file/81949419935.pdf
    • http://guides2alpes.fr/uploads/file/92919905379.pdf
    • https://408of53crownstreet.com/assets/media/files/37811775367.pdf
    • http://formpart.com/upload/ckfinder/files/xejegenajefifadikoze.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/026c9efc16da276dded21d3724a066e6/42140800789.pdf
    • http://toonesk.com/upload/39478941689.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/dba01c20d8a233ec4aa456d16b8595c7/77343873478.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131219f5464b---bajugezivukojefobisuw.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/99153188434.pdf
    • https://revive.fashion/upload/files/7886094558.pdf
    • http://budaors.varosom.hu/userfiles/files/fekejijevoxulepafove.pdf
    • http://security-m.jp/tool/images/file/jevedituzid.pdf
    • https://icbacademy.com/upload/files/54853863940.pdf
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/juroxuji.pdf
    • https://ww150001.linebot.net/upfile/files/20210905065115.pdf
    • https://moveo-sport.pl/userfiles/file/34679075184.pdf
    • http://madmojo.com/fckupload/file/18803865231.pdf
    • http://chickenwild.com/upload/contents/images/images/80018119703.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_off0000c7bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BB 16792 bytes
font_01_sfnt_off0000dfcd.bin
78c00713b6832f560ddbf189e2d3d76f87c89e9a828322cf8cdaa025b11de03c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCD 18072 bytes
font_02_sfnt_off00010ecb.bin
c320e68220aa66f317dc6d26bf1a28eef9ee12a4c48804bcb4482d9487ba762f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECB 10368 bytes

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