Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e6e1e19b10fcc1…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 09:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0686297230be62644238f32a90c2e298 SHA-1: b166dfcd5af94e07673e06713a88545c6603a365 SHA-256: 40e6e1e19b10fcc14c38d7f13f0e597bab032147e5bd0fe0349843cd6309c9d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or SEO poisoning attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://saluteebenesseresas.it/userfiles/files/64563046773.pdf In PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/22dfbaa5a098aab9c9b9e620197d4160/dawaribire.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/pefabobikedok.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161277a2d55ba3---wokinoru.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/1848382836.pdfIn PDF document text
    • http://mertlakustika.cz/images/pages/file/kipafefupozuzekeranepoz.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/7807919549.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/numetosikas.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/qnm7jl25tbarg6qu469vr61b9p/golopolifimugezojibin.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/43614677506.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c1b1f76d80b82a0d20be2fe7299d7f0f/35310805713.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7562a3c85---paxatiwanomu.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/a4c7ebfdc59f15a7631ed43360898b58/vupiginugofetuxudi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bad2532b6---tomimozilirolaratujebutaw.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/wifalinebikivipe.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d6670785780fbeb9cbc4169ba54d6081/butapitimowileforefe.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/0b1q0bisbdu0id7c5sj2ltrmbq/zapaputudilokumumabat.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a77236d2---30235457617.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16095d1fa8e589---numik.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/ferifaxup.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/retetolarelana.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/35604947809.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/12783871721.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/65956136853.pdfIn PDF document text
    • http://aven.su/userfiles/file/90120766122.pdfIn PDF document text
    • http://hflchw.com/upload/file/58827614173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=shielded+metal+arc+welding+preparation+%26+safety+student+worksheet+answersPDF 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_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 18040 bytes
SHA-256: ad68321f64bac3a615350592b1827043c4c76569eb1f0650ef72ce8421155f10
font_01_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 10956 bytes
SHA-256: 94cc8c1ae81e46d05229afbc007f44a7ce75f013e4ca36f1c9a4643b865a4fce
font_02_sfnt_off00012c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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