Malicious PDF — malware analysis report

Static analysis result for SHA-256 6456268759ae6ae9…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 10:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa530fce365c14a60658fb75a472f3e0 SHA-1: 3e23d93c0126d331f194a1060d9749643e7ba454 SHA-256: 6456268759ae6ae9f61e683cb66dfa2a1e991f70a436d6c010a44b771d7ed68f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://badaranquehablar.com/userfiles/files/36374423430.pdf In PDF document text
    • http://bumsnab.ru/uploads/files/segemuvazuxi.pdfIn PDF document text
    • http://baove247.org/upload/files/87993271188.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/mixobuwabusi.pdfIn PDF document text
    • http://cecev.com/stockages/files/rumirujexosavi.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/67865009526.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b650b2464a7---71135155673.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fba4d7bcf32---wazepisudobepas.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd03ce3f77---76117641914.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/bb134c9c5be3cc4aef41244a7a258968/71399007240.pdfIn PDF document text
    • https://tappowine.com/file/52510007148.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/pekasilila.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/80814657299.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/v8pq174kfqmdagk71o64ou522c/bivoka.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28c4b90b6---7460876874.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f8238a4c6---wilipenupukip.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/28169627558.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/salurapexajaxerinedekusa.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/falowasefubodavo.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/50605bbd2c3ef935a37709acd2a30342/13353095232.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms//images/file/verovup.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611cc07d47e64---37206711581.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7743879ded---lupajalere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bright+starts+bouncer+safari+manualPDF 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_off0000c9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E1 18500 bytes
SHA-256: d05f1ecf1849ae12784eeff364f33a4dd7be00b857fbab013398d17f251e0955
font_01_sfnt_off0000f9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D9 11076 bytes
SHA-256: a171c260960ad1df109f5f3752668e734fd10e0d504a5c4a81ab0630aee4d38b
font_02_sfnt_off00011383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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