Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d50de5d25685f7e…

MALICIOUS

PDF

104.3 KB Created: 2021-09-08 10:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cdec36a557f48344a3a6b537c9b6ae28 SHA-1: 4dd3bf30bd229b77845ec5785ba6ea513e324f72 SHA-256: 7d50de5d25685f7e0889ecc9ca5157f8ea6b54587ce9cad67ea79fc17442112c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://cructi.ru/uplcv?utm_term=the+overcoat+nikolai+gogol+pdf PDF link annotation
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f904d5ff70b85a9c3127f06326e12985/81286142751.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210624070509_frlgn3.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/olc1ujmlban98ev96kgjudd102/40933872541.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e456400138a4aada533a5657bab4a618/50862585038.pdfIn PDF document text
    • http://kgmda.com/upload/files/41107386697.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/lileleroz.pdfIn PDF document text
    • http://haki.vn/uploads/files/11017464246.pdfIn PDF document text
    • http://zuche0551.com/upload/file/915381911.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e01fc9db7074589e015112b5feaefa54/42544730710.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/212137292416.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/nonogi.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/85491908144.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6204d2f30f10d8f2bc010f52fcfa529c/mupolevadugadusoliberuze.pdfIn PDF document text
    • http://afayl.com/userfiles/file/88866611665.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/katilasawevokibuka.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16106c0d401de0---bakikudubezixekizize.pdfIn PDF document text
    • http://charontrade.hu/data/file/betusifoz.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/28770443059.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/nudopa.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3573fffb---mesavutixusavodofig.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/61218787576.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073710d49b8c---14881374988.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2b96ba8p2h4t6cnvdpi7gk0d81/74863247121.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e220dc65880---kilewebipozel.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741adbbc1f8---lujemap.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/cab9143f758d33ff34b15f048dfa95e4/sodemebenotudanagin.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_off0001348a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348A 10852 bytes
SHA-256: 1aa5f88a9a80ad14a8d49f2e77fc1ed9085cb52bff3401034fab5a0c737e479c
font_01_sfnt_off00014d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5A 18008 bytes
SHA-256: 8cb1234698ecd6208764bb1e487fb195de76383286885efecfbff4d6d052f800
font_02_sfnt_off00017afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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