Malicious PDF — malware analysis report

Static analysis result for SHA-256 b752262b1f5b9e75…

MALICIOUS

PDF

89.7 KB Created: 2021-07-23 05:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 136cdbcd6c8916a0909af69f89c21382 SHA-1: 146ef20e526bfb1a4a4b6e219eec0f986a174d72 SHA-256: b752262b1f5b9e75f93da32c306516de8108344d6287ca65ae63f546ecc38943
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/19b833fbda9cb9c0d23025938c4045a0/rekexoxugajigar.pdf In PDF document text
    • http://belgium-ex.com/images/blog//file/30693466619.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/97442624726.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c9620f1cf80a3b67d4c9f8e5c79f8db7/tebememadibevibo.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2374ea9f7---javalipuwaremem.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/87797204123.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/78702915489.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b75c2ecbabe---nomekuze.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a432b335be---4423412233.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c512f43242---74545795705.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a15fdc1cb6---kisazorodoxulagitasidu.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/ae5aa1dd51201efff87d967059dab697/dabofesobuwibawuzuxegita.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/r78fod4fm31ieo2po7oi3ssbvp/39719348874.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/plavrcjq3utl6p7jfo1mq6uf7g/fajivalojaso.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c862abecab9---85460082311.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/murijefovi.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/18374379676.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c8b81a2629e8ec0b84217a82685d5e9c/sogorikerijo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6a4t79rkl6e0pmms78hius33bd/41718767828.pdfIn PDF document text
    • https://blugarden.eu/file/noribotusizawewazewoset.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c886bb5d6d3---22578590771.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/gezokidexeri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+princess+the+crone+and+the+dung+cart+knightPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 17456 bytes
SHA-256: 4913f73c1d376548164c9e07cf2da8ba203c3839265ff86b5013e5e5b81065a6
font_01_sfnt_off000124c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDE 10904 bytes
SHA-256: 933cbe1b10d0e37e1e9b6f563a2b1ce02a4fd7e93d6ae48fcf24cf1ff7ea4bc7

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