Malicious PDF — malware analysis report

Static analysis result for SHA-256 807096b3db1d6095…

MALICIOUS

PDF

90.4 KB Created: 2021-10-09 12:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f205e23594016fbdcf81d56f9002efda SHA-1: acf66f07332726e920bcb489f0e74648bc79b85a SHA-256: 807096b3db1d6095c0c8277fabcc0476b7f90ef71d160feb67e24e6de0168648
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of common malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/pijilamovumowozoma.pdf In PDF document text
    • http://venusland.vn/app/webroot/img/files/81063267343.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9acf84655---bilewemelagawavulew.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/51466415007.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f45a0472f7---dipisunigolo.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/80578714358.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210903024846.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/zegolenurotedodexinagu.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/minapa.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/wikepoberatupi.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146f03f7f9bf---vosumolir.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210930225904238.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/vogafaxi.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/35067485919.pdfIn PDF document text
    • http://vaynhe.com/upload/files/57985101057.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135928f3b9ec---toguvunulusefon.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6fc08d74d7c59f7216bece3a74452189/86531102228.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/zenapenupalifisasitiz.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/jitopugumogoguz.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/kaxotiwesa.pdfIn PDF document text
    • https://33mobility.net/uploads/files/70806809491.pdfIn PDF document text
    • http://mathahospital.org/userfiles/file/fezifo.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/34897554675.pdfIn PDF document text
    • http://gestioniarmatoriali.it/lamomofe.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/biwafeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+emperor+and+the+nightingale+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_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 10740 bytes
SHA-256: 86aa3bca5a4700a530e5dea2c39e2105c9ebab304a9435c772561a1d9c5288cd
font_01_sfnt_off00010f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 20408 bytes
SHA-256: 13a76e048009dc46ccccefaaa20b808c40676cc8a069d7659c8ec39f20d4ec6c
font_02_sfnt_off000143f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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