Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e143aac7ab1269c…

MALICIOUS

PDF

74.1 KB Created: 2021-09-07 03:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b231d337733c463bd482dd2dbea9a8cd SHA-1: af24057f0bb8d2fb9c1aa7c77e895fd93c095ec7 SHA-256: 5e143aac7ab1269cea9d84a30def73125f1a377c4835ac7a8c2cf2d4e93d4e52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. This pattern is commonly used for phishing or to redirect users to sites hosting further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=victor+vcm+200+pdf PDF link annotation
    • http://kingcraftviet.com/uploads/ckfinder/files/85204697842.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/bibefoni.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/pumavixabuxuzo.pdfIn PDF document text
    • http://sql110.com/pic/gedewelupojaze.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/fakapemufijeferejimuzusiw.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/83980870318.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/1460077744.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/85775385034.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7a8fcfu7t42uvatqrcp3t6qiah/zexubiroledofa.pdfIn PDF document text
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/16610622793.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/f03jo90rqku0c5nbvhht8e9cnb/23234371409.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/99443046603.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6b1mo6930da21o3m4fluk9v92/gevivegozefegugum.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609027fa4e5af---tegiw.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16124592f44e96---senodavukelumogu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160769d4368f30---51729327982.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/8299633362.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/28519673279.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/kapexejamowidi.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1f49724442900453bf2398b34a8ca49b/7280340803.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094de66e78bf---80965363902.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/18155723499.pdfIn PDF document text
    • http://nprofit.hk/userfiles/49259941557.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/87927372446.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/bigobepuvowirokazegowawi.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_off0000bce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE2 10444 bytes
SHA-256: 13664aa706aa81d13d1d4031dc17ddd73f387d2c26bc836f60a7825c0f4b7c7f
font_01_sfnt_off0000d49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49E 17804 bytes
SHA-256: 33ce2c0b973cea6917e6207630a386c22148569ccea1155c605560b4ba03b816
font_02_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1