Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9e427f135b5e76…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 04:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b955483da320c50195531ef68ed757c SHA-1: baabefdcf8a200cc0dccd5815c738c0c6d9894a1 SHA-256: bd9e427f135b5e76789948e2d5ae18c745bd6bc0dd73ba3a6c910c83cd602be5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://irlanc.ru/uplcv?utm_term=arabic+calligraphy+thuluth PDF link annotation
    • http://rongqichem.com/upload/files/zoxotikowa.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/12552040872.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///34476401271.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb118cd7c7---bazepuvumajebiwij.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210604210017.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/98f6ba99feadcaeb9929cf0efce7085a/vomofekafosum.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/ralenovabuvoturaxi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef7e3afad0---2948762723.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/lemeviboramo.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/29656726179.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/kojibujawexadej.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f215ec56388b62bf77f97dff9c3d7d32/37049782575.pdfIn PDF document text
    • http://thaide.org/userfiles/file/zanopewevazefavodo.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/qgp4k608nvt3vgbdk4ug0q46io/lenowumaxofo.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/35616094427.pdfIn PDF document text
    • https://seerupit.dk/assens/file/61372700685.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/vowogijenogusibanetemajuf.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c851fc6acf---99294904405.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/zusuve.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/13068298435.pdfIn PDF document text
    • http://industrialdevices.in/uploads/waraf.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161006b8dbb66b---81024107961.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_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 20924 bytes
SHA-256: a409bfed781ea5244a0351197ea24ded2d8c57f3d22f5665cc068f15c1e8c1e9
font_01_sfnt_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDF 10464 bytes
SHA-256: e10331886fd01dc75ae1ca088b1dd410d41cf2133394b779c4f1836d16b27135

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