Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dde65ffd1a8c19b…

MALICIOUS

PDF

87.9 KB Created: 2021-07-06 15:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a802279c116338212e6efadba24c5ba SHA-1: d7e465defd9c2d93bec8f8e70bad008b8fd53a2c SHA-256: 7dde65ffd1a8c19b0cf248c878ff9904065612689bb1c88e4ac6e2a4c7f376eb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for further malicious payloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://krisoc.ru/uplcv?utm_term=halo+and+horn+effect PDF link annotation
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/9305940bf14ca8cd02107baed596b423/pugekobotexug.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/xuzunelulexumanubej.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad92d6dc496---mikujivikuvefakuvojoti.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/07cqea633v83n66r6j8lqckpbq/48491775320.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baca8d38cf---87829826116.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/piktufvd0l18e2ir1nvq6gvvlp/27340302849.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1e8f86053---65016461738.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/k04lap4ilndb2c7gh6m7mh5l86/92249614432.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e132a8324da---pemuxegovagunugi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b183c94e732---kojuni.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/40127794765.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ll878guroruie17m8e3pqrd9f0/ximogu.pdfIn PDF document text
    • http://www.toptehnik.si/images/43658023775.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d435bae8c9---dadefexiforasixig.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/vexikeroxiwadusuredos.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/18280039719.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/72079642944.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/oqb2ibmrbvhb9q8bj46pftpah0/21787437194.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/0843befff9b2add09a07ffc735c2fb40/19768667451.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/e13bafccf04f64fe40ebaafb802a89f6/nolozutiku.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105252045367068.pdfIn PDF document text
    • http://allycatering.com/userfiles/viwememaxedikesitutelave.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed15d54160---furazabu.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_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 16768 bytes
SHA-256: 6b10ecaa82192aa71388369854fb70e69cba946311e5e91fe4c09f00cf2909e7
font_01_sfnt_off00012352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12352 10304 bytes
SHA-256: e360f41021dfd6285dc479ace360d0dfdbd1d780d7e41a526fd5d154770ad60c
font_02_sfnt_off00013a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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