Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b420a55c46f450c…

MALICIOUS

PDF

95.6 KB Created: 2021-08-20 17:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7254e947bde2a1c61d2543ce27f1173e SHA-1: 51708ea5ea525b481d9c7f1ee6366f0f259786d4 SHA-256: 1b420a55c46f450cf47b808f2e377267b3c3900a28eb44df14305fae980c5d49
164 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 or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a deceptive lure, such as a fake invoice, to encourage clicks. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nomylo.ru/uplcv?utm_term=how+to+get+a+copy+of+marital+settlement+agreement PDF link annotation
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/4675238247.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/97488637177.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd91cb13e4---vapebewaluxakez.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/1992590611.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/generagikumopesada.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/4df7d2d62dae34baadc9965e5883793b/bitodawepagusivirepoka.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/1282895838.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93491679528ec4a517b343b8e525729a/51253607717.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pekodaxovopifatefunol.pdfIn PDF document text
    • http://apcmagon.com/userfiles/8004941101.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2e7ce65a004eaa4515d0cb06eaa4454d/kowulozaj.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/vibos.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/26253403822.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a324f343e---gufakogasopizalo.pdfIn PDF document text
    • http://khonggiansachhanoi.vn/uploads/files/90763777774.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/takawozefug.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/37317760364.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e4c4b75c---51648172803.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/vovesumawokop.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/92262206176.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/68661593411.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/dfa11b2c366e5c679551432356ddeda1/48014245142.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/93863310343.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ba905dd7d---xakipejepesavakit.pdfIn PDF document text
    • 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_off00011172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12989 11012 bytes
SHA-256: 423c339f47346082893c3172a3faef6dc1997f40b4c740f2441c67d7eddd5826
font_02_sfnt_off0001432d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432D 17196 bytes
SHA-256: 5f3d1e26e959d58d362aa5bb6b2f7bd01570f136b52f4e8378ab5bdfa85c91e1