Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83ae839c76e7b5c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 22:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59ed4858064613d784b6f9f0981ded48 SHA-1: 37a2eb0ee54f16c43b73ae94956e101beaae3306 SHA-256: c83ae839c76e7b5c0762b69d2a8bfbdcf4ac22f3db6c1433dde37aecb055d5cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely intended to lead users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c21eeede2b0---7963013873.pdf In PDF document text
    • http://gerocuki.hu/user/file/45313369040.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/vunemo.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/mewolaxera.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4bd047312---93120401722.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/1d3de7b2d67c9d71bcf94cbcfb267d43/sidugofawopukevetu.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/gepirusegov.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/58115471442.pdfIn PDF document text
    • http://apvn.info/userfiles/file/62939693712.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/sozopitexujurasunuturo.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/83270905361.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/65353052421.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ef8d105211da01b03901ed0fc5fbec73/32669992820.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/90138581510.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/fosidewumetede.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/88270827241.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/furuxu.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/likonuzunoxafexetuk.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955a74bfc3c---44151864963.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/maguwegagezamonirevus.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/9161522294.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/bidos.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e49ad79133c078c9afd5bd4cf44eef25/dipobikonoxukazewite.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/61716719476.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13f5844607---kasuriliwufep.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/woxenafafijalidob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=thwaites+3t+dumper+manualPDF 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_off0000e5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 10860 bytes
SHA-256: 1b2d434e1868212de9582e8a130d4bbf8f54a42127345b898f37bac6a91ca728
font_02_sfnt_off000116b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B7 18964 bytes
SHA-256: 0c4abac218210229f24db0d8760998662b1931b386de7b7ca8bd09c215f59f61

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