Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f34512fd4c9365…

MALICIOUS

PDF

118.0 KB Created: 2021-07-02 13:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4329e307e7317c7600eb3da9ab6474e3 SHA-1: 2c10832ba3bbfe182a8537ba82be3c6d2e386af7 SHA-256: 43f34512fd4c936542698d1d16c944550714c9699e5b8a8a6a94319207d857f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The PDF itself appears to be a lure, possibly related to a screenplay, intended to trick users into visiting these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d5e7383ae---tenosiguzevibusinulala.pdf In PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/fepapipitev.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160af79691ab57---zuwumavaxalufujogubodiwe.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab657dc1de2---maxibalovazukofuxupotos.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff879ea5ca---luvos.pdfIn PDF document text
    • http://cosyromania.com/media/file/vikokonojevodabes.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f3c233fd8---walorejodalatugokalexan.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc40d48851---5462840843.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/71712042718.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/37375539004.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098c69499519---puterutevolifapi.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/16559078607.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/oju5fve918pabui8srr12o2967/zobilogovu.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896a2ca230e---kimot.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/7197960002.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/boviwilijovikunadirul.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e1ab616c22bb568a12e08132b12d114d/jomumemam.pdfIn PDF document text
    • http://adveotec.com/img/file/15063072694.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f2be40df5bc76c927c302c5db6a65d3a/dawepebuz.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b319e693aee---noguwakuvav.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/96e77e9bcdd674ae776f827bf16f42fd/zokuvu.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/54691042684.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/42472632551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+silence+of+the+lambs+screenplay+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BC4 11104 bytes
SHA-256: ca4d3307ecd0f7d8b5a5af3ecad7cdd50cf9351b6c57eafe4467450195f8eb6e
font_01_sfnt_off00018542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D54 17192 bytes
SHA-256: ed15d2514c0834382fa2b6f23ad5fff390ee882a90a613163e32615f131d9aa2

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