Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98a4897ce89a80c…

MALICIOUS

PDF

98.6 KB Created: 2021-09-01 00:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a7b6845e30bc4e3fbbd00c0bb8281f22 SHA-1: dc755f6a3be9332eb922b072441112783858c482 SHA-256: d98a4897ce89a80ca277cb7b89b331a514717c9d5d9cee7bb88ac9e48859de0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://amunt.madteam.net/ckfinder/userfiles/files/17820617916.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f372bbca2c---47312879835.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083410b421e6---34629418453.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/ritefigevanedikilobazavi.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/99182371978.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/kabuvot.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4f52d9fdd483b0b8b01a2c331f3be51a/56041014762.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/45098060554.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a688903b360---vofasetagilodevixagi.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/65262994952.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/vofepurexivarim.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a614ad92e8---wuxiwezuboji.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/86960042062.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/vedevodotowuva.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/96578585460.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/21051139746.pdfIn PDF document text
    • http://erictex.com/ufiles/files/36353222049.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/gevuwumunerukimisotawemo.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/88693751750.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/julirezileparuxujofexap.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160eff725e3b3f---pabedobu.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/74004021075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=butterfly+tattoo+on+chest+meaningPDF 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_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 11048 bytes
SHA-256: 04cdc96880b7082be547e73788fb932424e548b11fc69a2186007601e721665b
font_01_sfnt_off000136c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED2 18068 bytes
SHA-256: 5800fe12f6bb33fa8122726423a49e5000081c8498ab8ab31ac268bae7940b3b

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