Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ca20893aaba7b5…

MALICIOUS

PDF

83.8 KB Created: 2021-07-07 00:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0095d191d5762f1c667c70126555e845 SHA-1: 7edfe8f5d8e45a391c26c1082fcddb2f83321b4d SHA-256: 16ca20893aaba7b5be9c95b2a2e4f2d14b5425d4b5da281f7863232bdba28431
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 reveal it functions as a link farm, directing users to multiple external URLs, many hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest the document is designed to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=best+settings+for+indoor+photography PDF link annotation
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a8368c055---71031284516.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/gewixavufabigutomuxo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e1ecde000a49c50d4e2c3140cf096a41/jewafuvuta.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/42046604689.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/17289922479.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae3900ef012f63badf569937fb77675c/xinex.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c784d0e02aa---72799640010.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7n2ci6giggcisr9tqj9nvif1c0/pufexubuge.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zixukofiwixababamunumi.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa64d843dae---28827093761.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160cd578fbc9bd---42242378418.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7513c6ee---mubenevuk.pdfIn PDF document text
    • https://service-panev.com/userfiles/97749856991.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/8bf21d4a9366fae3ce68bd1b6d4dce9c/vokosebetatubunuruk.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/xemazorukujanej.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/fekitapivukipa.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075a71122f74---wunurakamudiluguk.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/zabojidikigurefugujojave.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e08f1464d---20014128240.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/334b0c79a5d8fb37aaa7463ce3a78f86/lixezusesu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c81d5e3d28---tofumijadufugafaduzano.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/881b6b88f98d121f2483f40249e8ce7d/wowojeduruzagogot.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/34923171748.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_off0000e366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 16876 bytes
SHA-256: b8d1f70ccdf77a8daa203186f6e8d846f66e4d8a1bf8b27f8f2394252f4f3f2a
font_02_sfnt_off0001272e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272E 10896 bytes
SHA-256: b396bf8f40009c3b20e74efbcfa9081531d8c833c0dfae21d4e527cbfadf2d34

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