Malicious PDF — malware analysis report

Static analysis result for SHA-256 2724ce5c6a37a361…

MALICIOUS

PDF

97.2 KB Created: 2021-06-11 10:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ffc0460698d839d9a3af3041f5a42145 SHA-1: 1f2351679a13719c9681f0b6681e5149cc7677e1 SHA-256: 2724ce5c6a37a361c889dc9e4bcf7d3ee052a87d94ccd95e68badc926e69ab85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://synerhu.ru/uplcv?utm_term=unit+progress+test+empower+c1+answers PDF link annotation
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/a6rgrpfug87aocks1d0o2j865k/wejajefaxogipa.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/gusix.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/mefozap.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//36073747801.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160aafd4277396---77023727457.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/tetakovobovevogufimagekeg.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos/%5C/rifofatapiwuwiwukumo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xumewaxog.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/mukvk6jtop3atm2venun9lgtag/luzigafuxozuzokojek.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607255e9e6980---83199638439.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b631ec638ff---14109395541.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/630fa952c118015c10b4e96674ec83b3/xalufibeginiwizanuxisu.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/09ec90e8a974c4b4e603bc2796df51ee/37266173544.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6e4991fd---tesuwesofawumufipijekad.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/35006917688.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn 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_off00012db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB0 5356 bytes
SHA-256: 0e80f84e7ae2abc81ec6184f907edda4ce9452bda424ad676840e1b6de1868ad
font_01_sfnt_off00013ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF4 12476 bytes
SHA-256: 2a26fec545126df96f5c4966513ccc474927acec582cb4489804b749bdd9b987
font_02_sfnt_off0001683d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1683D 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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