Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab005ba3d21a8ad8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 12:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb2300bf5e29e34530249995c2b7910f SHA-1: a6684648cad890a29c84c99d6e744f30911ac23c SHA-256: ab005ba3d21a8ad86c64447af4382dd4c6c6d6902b06fdc50e9fa0deaeb9e57f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wahluenfty.com/userfiles/duzevikonapokutufutumob.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093039d4a1e5.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/kuxaguravamixirix.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/94480237621.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/vufuketatefelejolutilav.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/tek59okqi7n391kt9icsod08or/gojawisemokidezumil.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430090139901785.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/batiludajoduv.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210607_010541.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/donupupiwutizefodogum.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/30069247104.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/69092838088.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/83894432242.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/janigaf.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160758145b6401---3772805599.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/742f7060e49dee8de1a7fd5f9e15fc38/43157957033.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/zerujukosineto.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/bopuritaxopusogorof.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/jamugutufelewiwaxikamu.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/75412344642.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/xufajen.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/fisowikufufuni.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/pevonoduvititum.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/hilab3dtbks2jeu9ke99jsnng8/pikusekiratumepufuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=reengineering+the+corporation+pdfPDF 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_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 10732 bytes
SHA-256: 273ae01006c8909b593fbbd77e7b1e8395e6a71a36af58a4460b03ee6cbd63f8
font_02_sfnt_off00010d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D79 17632 bytes
SHA-256: 5dd6d9aa44b5264799fb38b37d1260739b0579dd3ac08174581249b1c928973f

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