Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4995109f332a15…

MALICIOUS

PDF

69.9 KB Created: 2021-10-02 21:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 04a3830bc4b02b7a808d3594fdb2d5c8 SHA-1: 9e4042784be88dd14555227f5bdbe36f01f8221d SHA-256: eb4995109f332a15e85497104c0dd83caa3b1d612a2b2a0ab9a73140c94f2ef3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://autoradiator.mn/uploads/ckfinder/files/66957282074.pdf In PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/gemegirififonopod.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/83581457712.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/pivexizunaros.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16142c0e58eeac---78387127691.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/61716858455.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20211001080624.pdfIn PDF document text
    • https://pindimana.in/uploads/file/vuleji.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/garore.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16141ffcfd83bc---tedafawazibuzowu.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20211002_6F7E3A109E082462.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210907233855.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614033d2c8f62---23413487996.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/96277178570.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/fonukop.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6cec1a437---84546109574.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/58484473984.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/furizujaf.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/zepolagedaxominepizokaf.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/niboxewelegivi.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acf30d1f94---34157028983.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/nirobifajigi.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ef40tr2c9a81k97ci1h9k1gr2q/65115572379.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210919112609.pdfIn PDF document text
    • http://domosplast.hu/files/file/37967679857.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/kiwovuvodirarusowaxox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=instantaneous+rate+of+change+examplesPDF 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_off0000b293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB293 10988 bytes
SHA-256: 7c01e48e82a0eead68b263523afd49143d403a97a16131d13a604639c0537c1a
font_01_sfnt_off0000cbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF4 15048 bytes
SHA-256: 96a18d3fba6ab9578747e4d044a8af1723b6b90d352d0e367f5448403eb8fbae
font_02_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1