Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a7dfaf6a018bfe…

MALICIOUS

PDF

81.0 KB Created: 2021-08-17 00:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9fbf29a4ebc4da82ea2e271a4fa9805 SHA-1: ae2bffa7476650987148a62bbba027b85f316f1a SHA-256: 57a7dfaf6a018bfe6b784792202475c710a482f75e8a29040c10aa28daa16e21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent to redirect users to phishing or malware hosting sites. The primary attack pattern observed is the use of a link farm to obscure the ultimate destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://workinhotel.com/upload/fckfile/jotubelorikuvubinoro.pdf In PDF document text
    • https://henklinders.nl/henklinders/upload/files/kafirevulitigataxate.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/41770693339.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610795cc1096c---simisuba.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/fatutorujebinulolapulewa.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611355bd2737a---76689810469.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/14717371156.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160729bfea055c---mubakuga.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072566e67f02---boxivisexi.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/zogivuweperixob.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/e363bce7428cba83e491a994be3e6a76/goraxusu.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/manofutu.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/2d8605552af4c3dceb15a6d0fcaee797/53802739968.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b08b3cffe---kizipizuluzu.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074815a23aef---66732946522.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///64427639454.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/8a4sutv17m6t5su495nhhme68c/59529116140.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/vitujemujaba.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e4b17c6ab---xurifa.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/69110112877.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/puxuxizuxugegutixetagi.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/b28b6ca4aab41d3333ab575e6b06a19b/nawenaf.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/xixomural.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/76275367570.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/28269089332.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/23974609994.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/78945733905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=worlds+together+worlds+apart+volume+1+pdf+freePDF 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_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 11048 bytes
SHA-256: 2444ad84cf68c9f3b1fd8425ef8bd6ca9254a24c01aee095966b8839c83e06c3
font_01_sfnt_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 17240 bytes
SHA-256: 8631298b003459e9f4f472fe494fefde9c614b5bc51dd04df3ab7f465407af0f

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