Malicious PDF — malware analysis report

Static analysis result for SHA-256 5805df6d9c494e46…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 20:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69c927b32f8483f501994ad637fe8aa8 SHA-1: c43b8e09cccf65d259478a43ccd038913e655580 SHA-256: 5805df6d9c494e4686246d8f1f36ce9acd8fef62448be9b99e5ec469f8185711
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0175efb88---zijojezebub.pdf In PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098bdf780d60---lajogagadidapag.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/gibus.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/78334044225.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610de8f50ada0---24938371504.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160865647661fb---gimazijuvegonexupik.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0f062a3d998bd2f09e85eb8ec9cc529a/10161943833.pdfIn PDF document text
    • http://leguido.net/files/99423668785.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1c3a9820b---letifurenibuferebekel.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/57416334116.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/56958240035.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ded69d20f---2401584352.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa3dd8dd88---11899378862.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/41530951020.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608150c099891---27602811791.pdfIn PDF document text
    • http://adveotec.com/img/file/tuzudusifiwup.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/jvel982ptt6i07oeof7bt5ofin/76639602085.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/2239108332.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607dafdaa83ce---fuxikeneg.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/moxinuxoselapesisa.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607658b851a84---mikefavomopipitasadozozo.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0vrqqe1ldhbgh7peo8107ekq9v/newagogowodipof.pdfIn PDF document text
    • http://gtshotel.it/images/file/2845033846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=prestige+smartplus+pressure+cooker+user+manualPDF 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_off0000d213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 17496 bytes
SHA-256: 6d1231b2f6ba1820f45772b99f13cbacd14ae60d7b2adb642cb4ce9d0a9fc171
font_02_sfnt_off000116bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BB 10912 bytes
SHA-256: 9db7bff3f22666270dd2593a0268b106b7a09fb54f13143695860bae9bce3602

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