Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdc27541a32c661…

MALICIOUS

PDF

90.6 KB Created: 2021-07-20 09:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 91eabac9160e8cdf76d7da6b5529227c SHA-1: c26cac73aca0e7828f3fd8895bf359f039865087 SHA-256: bbdc27541a32c661809d85923473a4b021e2d682e0cde10ea49a249ece3e0908
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads, indicating an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple distinct hosts and UTM parameters suggests an SEO-based distribution tactic. No scripts were extracted, but the primary attack pattern is the use of malicious links to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607072ed65d91---33495412922.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e276da7c---55749406396.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8005d6957c---fefiwapatowaxalolebar.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088385a77746---48357721521.pdfIn PDF document text
    • http://atomleasing.ru/media/File/bador.pdfIn PDF document text
    • http://azizolace.cz/images/file/92552516114.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/sobum.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3efd87b0ae---gilirijuditeworolava.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b754d1584a7---jegipagexejazo.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/melulovuvisewi.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/dadabakazogiredekajikeka.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b399300eb45---69307459408.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/54849649204.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f5e711a6b---gemumakojizuron.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/59598454842.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/kuzoxesi.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/842cd1abe8a4cdc7ad05b85f5a3a090b/94689053452.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/ec6f2aff6fb89772fb82f5f1ffb9b024/8259747003.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb91c24248b---92921517591.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae08872fd9---balokujegikedar.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/97413719953.pdfIn PDF document text
    • http://gonuldoviz.com/upload/ckfinder/files/8356753269.pdfIn PDF document text
    • http://guchenes.com/d/files/vifotijixevori.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ffce7cec5---sejutunejinebokudevavuzu.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/2gr8d2absff6bk8a17fcha6maa/zupozavagena.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/xebakumivubizujososula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+concept+of+law+hart+pdf+downloadPDF 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_off0000fda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 17984 bytes
SHA-256: ad0d790d0ee6530bd4a9c9e356008856778fbafb658ffe1f919c2cbb1bb6ce98
font_02_sfnt_off000144e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E8 10508 bytes
SHA-256: 6e41a248b7d7e2093da98c582d35a58f5b0ff770b915662abe91e11f953776f5

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