Malicious PDF — malware analysis report

Static analysis result for SHA-256 686952c6aa450ebd…

MALICIOUS

PDF

117.9 KB Created: 2021-07-08 08:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0c3a2b4c25efbac64e4498cb8e4652ef SHA-1: d2786fd0b916e1f795f4985c9f221509e6ad3f4f SHA-256: 686952c6aa450ebdf52bb233eafdf9bd2735c9c4fe4d8deffa166e646615a602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the presence of numerous external links and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9676

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://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0a41814d275caba3972c082a2304e711/puvonuxapobavevoka.pdf In PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/vufedamirukoretujosi.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/mugarisoxix.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/vimoxogarekoxijorod.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/aaf57c96214ab97c8b9c9fc9541ae123/29274502112.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/leraxo.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/memaf.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7cac76a5c8b48f336d44dfc1f671cf4d/bozage.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pt8jbj920hl9i4l4nb0098a1kt/58198515344.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/00357d9933f7d807c3e897ceadcd225c/razifebusoxesuravegukebi.pdfIn PDF document text
    • https://papiratisk.cz/soubory/nanoloxozitatozuvo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160729a837f6f8---padasulujogexedidus.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/rewobebazisetujija.pdfIn PDF document text
    • http://laduses.nl/image/file/56776682587.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/1629456642.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/o9eocll7rkoqsnvv9vb6raff37/zenagurumiz.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da38758182---16794513809.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/telorinuzula.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aeafa9d7a---70640715879.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/47328555662.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bcd83eac9---tokuwakusakupivi.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d94d2646---64714213108.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e50d1b350---66550145567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=2+to+the+power+of+minus+2PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F1 16500 bytes
SHA-256: 41ddd43e3bdb2f8fb5635bbc4a84217d82b337083b93976bce2ccd5767bab356
font_01_sfnt_off000157f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157F0 21364 bytes
SHA-256: a588b0d0cd74108e1e1716335954d1eae6e91ee4ffd43cd8cb9715115e323137
font_02_sfnt_off00018fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FB6 10624 bytes
SHA-256: a37a5a11061b8c1922bddc6f3d6eab0885e6734fbf52935c4265f556806618c3
font_03_sfnt_off0001a7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7ED 2100 bytes
SHA-256: 38e572c6df274c65fab55aaa68e76329d25027d4caf9374e30b233fe7a26c728
font_04_sfnt_off0001b16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B16D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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