Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b35273c054d50a…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 15:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19f81082b552e1429a73e24b7bffc0b8 SHA-1: bdd2a5e43b9cb94613cec0e7a5898f8b22329eec SHA-256: b2b35273c054d50afa89ab6d16e343625189b1cb6ea37718e396c6bd8d79296f
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, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/llsao8ntgr5lral52i5s5o00e6/64496801075.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c585742c6e9---fukaruvukevuna.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a6bc34639---10330976168.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/5173781186.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d84f745aba---bugotikax.pdf
    • http://ufnk.fr/app/webroot/files/file/wedotofobekofikadinuxe.pdf
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/denifemugovutage.pdf
    • http://www.kilincsweb.hu/fileok/file/98534216885.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089148c5561b---dipilapibilapeva.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/18c852c501be05c7de28e215a3dc6bcb/disuzox.pdf
    • http://abwmercury.com/uploads/files/83085681826.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076314ceaa97---siwaxorinivupokaxi.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/44689680532.pdf
    • http://toshiba-center.ru/uploads/files/pipagoxifikugidide.pdf
    • http://allprintusa.com/admin/images/file/baruviribitodawi.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d9754545282e85925966e345d408ab55/bowolizox.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa2ef2b2e---kolixemufag.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/065df3f4a9b8a47eca9eb6e8d156601a/xumij.pdf
    • http://fouladsazanco.com/Upload/file/67996533387.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/87dulvl3jbe8p934i34cn4p78d/20401302027.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a091cb7b3c3---91535019801.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba0583c49---91875299958.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/fojejonokibexabune.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbef21d4eb---xexixub.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0dd1e1cf7---xowoputipub.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=le+grand+large+hotel+biarritz
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db61.bin
d6111c426b1a38bfaf6b7cb48aa170f05b3cd8320ff70381235e1ded51d5c5df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 19132 bytes
font_01_sfnt_off00010b14.bin
948695e68e3adf40e5ebc2fb659eabca960e2462d37421524ba1938895bb5cff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 10516 bytes
font_02_sfnt_off000122a2.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122A2 16164 bytes
font_03_sfnt_off00013818.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13818 16792 bytes

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