Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4224f1470fc1aea…

MALICIOUS

PDF

88.8 KB Created: 2021-09-17 16:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36c26c940f339688c5d10a97462b5413 SHA-1: 93501088cdd21f5cb9e805532e0288da38a3398d SHA-256: c4224f1470fc1aeaf6ac6544942c38b5517f839818457f2cbb72abb362681fad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm designed to lure users to external content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://njbeihang.com/uploadfile/file///2021091016050641.pdf In PDF document text
    • http://polletnv.be/uploads/files/37288460478.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb061c1011---koribikisadapazumujumov.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/67969913227.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/zujaroramezasaxodewigag.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/safopurebiwijoge.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/45740556109.pdfIn PDF document text
    • http://skncn.com/u/files/zumavipikoxuzozeromu.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/87561316956.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/gajekilawasikari.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/20999849708.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/10e6dc9f7058b0adce0684bee2cdd05c/zoxazolaporababog.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///42130827895.pdfIn PDF document text
    • https://beaszemin.com/files/zagatex.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/rumomedamirinoxijudi.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/ripivekilobimiresorojixi.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/39229079910.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/motewogelutuwi.pdfIn PDF document text
    • http://myesen.life/userfiles/file/40506157607.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131086ccc9b1---68251641274.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/xogapamigosujuduro.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/wawelipesijogidizukax.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/wokipuluxak.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/nasavot.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/28681865968.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d94c7aff31---furopajivulopozenimuvoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=storychic+pro+apk+downloadPDF 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_off0000f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7A 17676 bytes
SHA-256: db1f442ae6f5bac52512465300425121216416f9f1ea541eed719a5b831a7826
font_02_sfnt_off00013cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDF 10676 bytes
SHA-256: 1249a9a4e27261e89acc4cfcbf551b0483a0419b1e8700741222ac814574db41

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