Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1078433a39f7b3…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 10:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 264eea438346eb71705bc4a3f911555d SHA-1: 66140db5fcd57f2b8dc94f907e1afd49663d6419 SHA-256: aa1078433a39f7b3e2568a32beb2e4e238977e10b0bf02b7086cc63fef6e2cad
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file contains numerous links pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of these links indicates an attempt to direct users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bf96a8cd723---puwoxijudufurudoxufuven.pdf In PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/01ab9279ebb4f1ccbc5e117021e13372/tutujekakimepakedukiseru.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607246f77a23e---20444975839.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b653c4d1cb0---tidedetujuzodukaved.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/80568407607.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/23098272636.pdfIn PDF document text
    • http://artside.org/data/temp/file/89006264438.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/38899076048.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/22179381565.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f3ea013e3---87472973959.pdfIn PDF document text
    • http://dentherapia.hu/files/file/kanuxesedezije.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/2730320580.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9eb20c669---26463361228.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/kokonenogofezaj.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/88049819052.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/pemubirovuno.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16095f354b1e5a---zozupopibepir.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/337f3daecb189390529438c234ed6d67/dajekuratomigosobepuv.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/fubaz.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/sixelupewefepipumuwakaw.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/97244591961.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210611_075204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=conundrum+anuj+dhar+pdf+free+downloadPDF 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_off0000de36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 10752 bytes
SHA-256: c8d5089a4a76f825b9339169076dd3b9e910fdfe55775d392ad4f638668276ab
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 19272 bytes
SHA-256: 86a1e8ae55791361d2a49b1fb72e3cece8bfd15cac539cc76334022fa29c496a

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