Malicious PDF — malware analysis report

Static analysis result for SHA-256 f716cae6f1b6d3b4…

MALICIOUS

PDF

88.4 KB Created: 2021-09-19 02:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0bc4bffd7d36c5e765d5abef364c7ab8 SHA-1: 28e6200f3d4cb77dcb6b3a914a52c33571bb2a1b SHA-256: f716cae6f1b6d3b47feeee1e0e4fe722ee7ba35f58864e0d685149ab4c4a445e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=camp+jupiter+classified+read+online+free PDF link annotation
    • http://basketaci.cz/UserFiles/File/fakerugezijurod.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/51592214174.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/golidedinu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614216ea9e7cc---nojozane.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/wifovexafugen.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/19351634881.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/rpot277c7k0v4qa9spsseaob04/37022665581.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210915210302.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/xifebivumiferopoxolegajad.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/bovofeg.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e21440aec2---80759059700.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/82426505937.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-5/20210905102706742664.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f498cdd24---kuvilomomiberafa.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/57701309504.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/diramim.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/mizaz.pdfIn PDF document text
    • https://flyags.com/editorResources/file///kuwok.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ors6dj7gg05m18s4unhgneiuhg/87603790262.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/30315502617.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/bagokibapulakes.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161404cf935cb9---47767216147.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/ravijurenakuxabigufa.pdfIn PDF document text
    • 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_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 11040 bytes
SHA-256: ec3ba6151ccd53d4b234f1f62f1effda3d0be1cd9dc854282134ada557d16da4
font_01_sfnt_off00010b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 18428 bytes
SHA-256: 62af88d3728d9aac08256cb501b790b2a2a77019e0ab8aa966f133940831ed3e
font_02_sfnt_off00013b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.