Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57733968f0110b2…

MALICIOUS

PDF

96.0 KB Created: 2021-07-27 17:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3071a0995f9726870a1e937d215f81ce SHA-1: 4a945a7492f86e1a6b5ca7488748ef00399f0b3b SHA-256: b57733968f0110b26599c8b17fd7ab8e04e3abab76d43ee516f755a165477b57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links and the 'link farm' heuristic strongly suggest the PDF's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/mnd2sgtu9r87hv4j9b70qfqch9/zukinurizebabafamibe.pdf In PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/f637b1f27f426c8de5e8b6806d169b13/14268190502.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/sisitinojimazet.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/cnsk1ldttp4h439vmeokuc1lc5/56739927519.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b704c3ab66---kirobiwuwed.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a031161e141---18996212550.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/79473541901.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d06afed30fcb565cbaec70fe0ee24b58/20466515993.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0bae1d984ff2ba65e952c93ac52bb14b/72081629784.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/640a1c13b4b3a37fe417af7f1d1f80fd/72005708827.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-6/20210706191047125297.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/56223808562.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210724_013250E23817E318.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160898028350b7---botakinuxodefanezusoju.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073513bca535---wovisewera.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/tqmhimcpnpv6i84bu06hd74j6o/12397202212.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef6416fb23f76dbace9cb456ed30f2a4/lituxezupepotenabezazif.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e04a7643a---54944039055.pdfIn PDF document text
    • http://artospace.com/pics/file/zasalebafuxo.pdfIn PDF document text
    • https://rcot.org/userfiles/file/68106093796.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a4733dd29---nukofijolulafenixuwe.pdfIn PDF document text
    • http://zubrcup.by/files/files/44730349347.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db3799449e9---36942133798.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2e5d0a16c2c0bcc1798f166e0918ff9c/20296883733.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7804b673d6---71996117327.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/xuxem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=wonder+woman+1984+full+movie+online+dailymotionPDF 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_off000110e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F8 17540 bytes
SHA-256: 06f6b3a665253ae3cfe17b455c20c668248bd60b40c2639386d67d137e82b699
font_02_sfnt_off00015717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15717 11212 bytes
SHA-256: 9ccad09d3afa6e1ea642f06307fddd153e221fb4c36852091389d682dd2ab88b

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