Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cc27aa3234953f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 08:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5eed9450126c3fd6b71bb773871f57fc SHA-1: 3a20fa9690ceaf78fe218ee05022dc2259ad6c28 SHA-256: 25cc27aa3234953f9edb1f9f98047fc4d3a2ccc4a404f2109bb909c9990e158e
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 WordPress sites and disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce066b55fb2---nagagegud.pdf In PDF document text
    • http://rayanchem.com/d/files/52675876099.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/10482221982.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052821512116.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b487467ad6f---91999105988.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021080114304473499.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741f8dbcad3---gixumetudem.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/32173738690.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210901_306710C3C25570B7.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b5ae022f279b85c1df194134b93aba86/bibobivadatixazosafikipon.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/612c058d018bcfeddd499e4a9e8317a3/denobusuvuwarobolagu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7430b5514a---gakiromodavizotesovu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/bfff83527372e25cbce4b861d5e8544a/xugisakawis.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/nebopuzego.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/noxibowuvigekomuwot.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/19684037986.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4cf13934b863af8d7333773f2b521f29/32709596507.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e60928b5f2---50754584714.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/4277965035.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/024278bc3cf8d63f2dd40555c5f5e551/4562966705.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/vusefuzivobugafexawel.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd61fb06087---34732937250.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/hgdrmh8sgp6on0h8df98tgp8ol/femuwuganuzuxoxo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/28909079207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=jspdf+page+break+not+workingPDF 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_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 19236 bytes
SHA-256: 7d6a3ec32dc6d22300fe5c766f4de9a22597aa6bba0ae76c5f7428e093e4d795
font_02_sfnt_off000128cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CF 13384 bytes
SHA-256: 93a3acb07f84acc5cc7a5606e6247285e07308876c72e3b64a01e9423d35239c

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