Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a02358fe0a3cb3…

MALICIOUS

PDF

84.3 KB Created: 2021-07-08 00:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eaa2391c0647b2b36d8210c7a6355597 SHA-1: 502499776d2dc741bd1eee3a3e9e04d6f16e8471 SHA-256: 21a02358fe0a3cb3cc132d18b783d9b15786367b1b35d1c917a328738efac9b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing pages. The presence of external URIs and a link farm structure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=putney+to+tooting PDF link annotation
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2976a49090---suzenedutuvekem.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/vorenewipisilap.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ecd5cb1b---lukimodo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2e1e818e0---86405786307.pdfIn PDF document text
    • http://pinxedien.net/upload/files/poxufumupofidebipujog.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086acff9c6d1---kanelogarunimorerozizaxaf.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/97349550060.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/foganoxusax.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/raa2bd2mvjon0drubt3hp03c35/61944808902.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e618e67a043---nipotofezugepifuvofasuva.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/melegijuxanivolir.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/89f5950da8f23068a7c968341b577a63/65782753558.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/gisebima.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/damipubumowewiv.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba461ec236---68263735967.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd694a5fb9---37610351551.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/0ni26jq4udnjqnp1se066gmev2/81330815784.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f4f49f6662facd67bf9e5b6fe87531ce/7851219424.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/65615795750.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081474f56994---lukebemofibilekebowi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd824821c2f---34464176402.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/kakufijomanepusibijuxo.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/89953694984.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/30093591483.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/dusovawogas.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_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 17832 bytes
SHA-256: 36e328c6ea08df0c1accddead298ae6cfbf703f1256777c2b1d9f50137773fef
font_01_sfnt_off0001142d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142D 10020 bytes
SHA-256: 6ac530ad09f6d2aadf72fdce24b6ab7a173de35e4c5308cdd0e331756fed9f7d
font_02_sfnt_off00012a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1