Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e689cf4ad2240a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 05:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e0078d202fe6ee3245f76c4da113d1fb SHA-1: f58b2439739d484c66fcbcf3e21c9c320a2ad8a0 SHA-256: 45e689cf4ad2240afc33ea3af61bd02d00519f099e1b912a78f30b5f2ef2c356
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=dragon+city+free+download+for+pc+windows+7 PDF link annotation
    • http://caytrong.vn/Images_upload/files/86258076606.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/tuvisirutisega.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032c31e5c5---59643055423.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/83627212140.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1b67353fc67edcaf44792d2701476a1d/nutekiselakiximaver.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///202191692579923.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/22140509643.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/falegebotika.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/75544051494.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/vamigajajojafapipuma.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/volitewon.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/31374469882.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/96401238889.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/jdfv7fg715dg5ggv25isjjbl87/17062740535.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/44730926311.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/92796926351.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/qkpbe7r1utdehecsoqhja1agqj/92085760249.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/jojoxaliweju.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/todetinasikopojelok.pdfIn PDF document text
    • https://yuktogel.com/contents/files/nemozigenapebikatelaxi.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/19476329326.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/930550968.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_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 17844 bytes
SHA-256: fe4d3b0f27af2b38ec697ecb7805842dc9f2e2f0c5d18152f2fc245b705984fd
font_02_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 11048 bytes
SHA-256: 98a7a4f5dfb3e2a1ec242479bdec004b5fb7425f88c1f92644b73020f49fa03a