Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6902860fa8e9b0…

MALICIOUS

PDF

83.7 KB Created: 2021-07-19 06:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d716e7ff0aee5f5cefb6cfdeb181fcc0 SHA-1: 9763f5a49e02d7aca68b5fccbf13321497efee10 SHA-256: ba6902860fa8e9b0496ec4e71e65fe9917751fc169679a3ccb31604c21551c30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to lure users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://perfecthospital.org/FCKeditor/file/laruju.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/15c9e32e42d956159dca815fd70b564e/89418368590.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4704ccce8e---bamuperigimuka.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/cc6ouvq52qp9op48e09ho7lfv1/38818653702.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/visfu9jhddn466upn629k2hbik/84369852736.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e031a979f597ca5fc95407014a7650dd/17476464005.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094933202599---sisapazimogafutej.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/29tp5ue83msbu4osu15hrbij47/kigolunewiripavif.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607218cfde07b---gexezuxewesozo.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/b9a9a856a21fdc9f1a8626021b096885/bivugowugumilexisis.pdf
    • http://oreade-breche.fr/userfiles/file/66266768466.pdf
    • http://superplasticizer.cn/d/files/42608337789.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1cc53981b---vegagotew.pdf
    • http://ginzaoakland.com/uploads/files/58956948463.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889471b0113---wenilozolifinepefaw.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/lofibebevodikijasuvi.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/eff8ccab29114a25efba5580e9eaa1fe/topizididip.pdf
    • http://nceed.kr/pds/userfiles/files/kuditafufetujobi.pdf
    • http://albino-pitti.com/pub_img/file/3298796706.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/7ec498142aaa0e172b6addc1c7bed920/92186073634.pdf
    • http://garderoba.sk/images/_file/91218991101.pdf
    • http://nomorecpapmachine.com/userfiles/files/67037643249.pdf
    • http://energy-labels.com/userfiles/file/15266827160.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/78f68c74015b367c6dd97baea51bc77b/rikimuvikujup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=howth+tide+times
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e1.bin
257990062225381fc8622c59ba3b1b409d3827031285b7726dc681a9b3329741
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 10180 bytes
font_01_sfnt_off0000fab1.bin
8d40983f9e3f4c2964484287c91c7d7b171340b008d44621d776d4640d93ff5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 17292 bytes
font_02_sfnt_off00012825.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12825 16792 bytes