Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c19b3f1507ba53…

MALICIOUS

PDF

95.2 KB Created: 2021-08-14 23:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d68a06c74c197a63185304bc89dcecc SHA-1: 80ff15fa1fed45236d624f45e6982684db25eebf SHA-256: 94c19b3f1507ba53b294e24bcb65c323e6b30446b28cc027aa1bdff24442d3da
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Multiple heuristics identified the document as a link farm pointing to compromised WordPress sites, specifically utilizing the formcraft plugin for file uploads. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b453134d477---27848667057.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/esd3ve1685laatgmqnhflo3hm9/fepavoju.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7dea2128d---geniwudumitadoluloj.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/jofomekewobedimelujolixe.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19730aec75---bogeba.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/kumoloximokidosasim.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/tekorudumolukamowekus.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/pitojuje.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/vibunas.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tnmbrsu85jto5ridpshtp1lbdg/wesefomopawero.pdfIn PDF document text
    • https://nadamasristorante.it/file/biregiwowuponufipi.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/batorejoritomapon.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210803/2350508864.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a354f203b9---jawogesajajuv.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/12950807051.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f6937a1ba52---16670808459.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/67133752862.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/85183455859.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/c19jpipatij6jur1acgqjd8e7t/57338341045.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c45290a79---nixapajedum.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/20170160850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+does+ss+mean+in+proofreading+marksPDF 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_off00010cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CC 17824 bytes
SHA-256: 1bf5b8e829b090222933c22710818bac0f01b6a3cf27a442e645cbb2282efcf5
font_02_sfnt_off00015307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15307 10984 bytes
SHA-256: cf56578a69c3baa3906cba29477b786fa9511e4884fde170f3f554459cd745fe

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