Malicious PDF — malware analysis report

Static analysis result for SHA-256 99469684e15258b9…

MALICIOUS

PDF

74.0 KB Created: 2021-08-30 18:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab877df07db1ab4f5b3563707d1a78b4 SHA-1: 3bf0d5723b81924eeb8f84d151f267daf3251274 SHA-256: 99469684e15258b92d8828444736e9de1d80bef3b858f1e3e79981345e347429
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2d33c8d85378397aba4618f8c4e240f6/92264166793.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/el64gfahc7nu7b2059pr5s0f9f/32243570602.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/49021931932.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e57b2deb3---sasoramiviwasowuva.pdfIn PDF document text
    • http://bamila.vn/luutru/files/sofibol.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2b9fac841c68bac4f693733b90358904/640711973.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/gufaferi.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/36046834538.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/supugerezogipuzifilavixo.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/dinawiwexebipolitened.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/tujofise.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd785b9a2d6---70758195806.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/53350151456.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4c1ada6a34dffc95680ca59e68a0e582/bukuxasimefakiteviwir.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/7665764246.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/71810781118.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/wafuvefuk.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/sojazuxaseguxitasujatevam.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/762921535.pdfIn PDF document text
    • https://cityface.cz/res/file/17632776913.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d74c3fd25ee---59198046105.pdfIn PDF document text
    • http://plncse.hu/php_data/file/xivatalagapefejuku.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/55149664081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=erikson+eight+ages+of+manPDF 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_off0000c209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC209 10692 bytes
SHA-256: 6f0bc3aa0f73bae714bfc920f54412b32a30c066818b660ac61f8cae6c70b0be
font_01_sfnt_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 15596 bytes
SHA-256: 45825b479b7d918c8e7cfdd50f6bf53c4d701c9386ed39493081122837532d3a