Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97f0ebe9869c3fe…

MALICIOUS

PDF

97.5 KB Created: 2021-08-21 04:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73eee9821e34e38f1550466f09e510a0 SHA-1: ac18a451286076c53ed2d1eec40c15280b75f40c SHA-256: f97f0ebe9869c3feb35b03b9d1498863ea443b850c9cba840ce721d8cf4c5725
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://huntic.ru/uplcv?utm_term=how+to+write+a+personal+reference+for+a+student PDF link annotation
    • http://designbeginnings.com/upload/file/vituzojufemoveru.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/43120355228.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/48857179954.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads//files/202108102105297104.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/t1o9t3h92tbk637o9t40hikc1h/zoxitixe.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/00di708qqvq08gbfi94eu3qk9s/jesedezirizadito.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106081224387859.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/magox.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4df2c0ad91---jegukugifa.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/hmos5pou5di5gsummu9hg1it3g/vifojok.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/zomijegupuguzigajeloginu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4c74a76f85874ddce1bf75c8ec138a7e/xeguvafuridodakejojuzite.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/77723273068.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/20420630039.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/1229267391.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/norizus.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/aa2b26e273ba9d601c7c77d711e96d46/56966001300.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e9d0c12dec834be77ed5c0e921e722c5/69141974130.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/71140901446.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/61254192865.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/novosivadalaloguluf.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/edt2o1s90qucufgmbfrhh77ivi/dulomamazisav.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/66107202469.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/7302497888.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/zawofasosa.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/c3dfdbf2ac08755c16de74b313cc739e/91281106617.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884a14b95c4---guripelixirid.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_off0001175f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175F 10792 bytes
SHA-256: 3d4c35f56973047afe853b7abf626d122ff84e27c9c5867c9b6b84f52e559ddd
font_01_sfnt_off0001305e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305E 16960 bytes
SHA-256: fcbcd11455cdbbf89be9887db45f654d00ee4adc3357ba4dfce07226b478f484
font_02_sfnt_off00015c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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