Malicious PDF — malware analysis report

Static analysis result for SHA-256 c707fde95951dcdc…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 11:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f37de276299a6a408caf1fc6a81e258 SHA-1: 5258487b64eec920912618830c3b5c01a188db54 SHA-256: c707fde95951dcdc88f502deb549f870a6e222d19533ca06bce00d526db758ae
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely to distribute further malware or conduct phishing operations. The presence of external URIs and link farm heuristics strongly suggests a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://krisoc.ru/uplcv?utm_term=7+heaven+drinking+game PDF link annotation
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2331812d05e1acf92da235c1e73b6f34/63624787194.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1fe5d20be---zaruxitilatiz.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/987719a9d1a585f05938a23e6902835a/peforoso.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de8b1e7c2576efe1d647e2c35f426049/bepofirapefonalim.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/46c08b3cb68e9774d3b2d99550341337/29853463964.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b891ac75ae---lixefoveramesi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952f506ce0c---xulakobomedamojalopubo.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/xozunejaporupebuxok.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/scb0bcliaeto9u4u1v5m8s7qfi/82465552547.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/jazanosulafug.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/povobujizovodolisonutu.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/5dc4a2dc781f6b420d34a9de90454a2d/59678209909.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/78449850139.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa8282089---27074193061.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/24396669473.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/sovedotarifonatuk.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/laberonadutedula.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c04937b1dda---durarisitogazasefavolex.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607956255b2e5---72291227512.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/jifukasutobewuw.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/geremata.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072969685ad9---xamezakinoxek.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_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 10376 bytes
SHA-256: 227392a3936cddeacfd604423c697d48d24e84dc7a53a324712333f1a820298a
font_01_sfnt_off00010520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 17184 bytes
SHA-256: 7d1418c98756b36286cf31c991b9a08e73dd8e633b7dc61728d37ddd9d36b7da

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