Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbeec356072ea7d…

MALICIOUS

PDF

88.1 KB Created: 2021-07-17 13:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2772d4d537206fde57007cd5489808f2 SHA-1: 83f889f4d8df8c515b135f4fee84e6bed8e61e9f SHA-256: 7cbeec356072ea7d1740f65e1dce44535f314d227e91f603864f250ea0d2e6cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs hosted on potentially disposable domains further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aeddb617e2d---42057409635.pdf In PDF document text
    • http://blackhorsesc.pl/userfiles/file/43835047397.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/dimerelefijurutevapile.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/44c3df0cf160476e8bcf10730b06cb19/21000852150.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609871aba40f2---89734620016.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608549e7bd237---rinufotudaxixejevisemul.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/19fa92b22147e417dc60ee712845a16b/fuguzupa.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/zikonulexuzisitim.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/80759775136.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/posepivugirewogowibimonu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4299678caa---92618021307.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607211f3bede3---90911909974.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d5e96a44b---47950660004.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/28b18ad9a05c30b6bf0fa517a6c62092/favosizusitenetaxap.pdfIn PDF document text
    • https://digireg.ch/upload/3625436758.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/415d866158321ae4c053ff8bdbd63daa/govemanuxekutenozegoziz.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/kekopitutinupinivodejuvo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/gkqstre9jjkm7m95tje31uh7k5/kumovifurubajuvuz.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210715223024.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607576ab9041b---logalataxutigejef.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/76544990760.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h7cma36rtobqhhjnkcnfn6g3t7/48060057404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=right+thigh+twitchingPDF 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_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 17480 bytes
SHA-256: b49acf582e3357d391cc1c53daa3623b184959f6bb597b7871e1749e985b1305
font_01_sfnt_off00012431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12431 9912 bytes
SHA-256: 2e75b0696cc84d4356cb6cefba52b1bc1e3b0d2073ebd6094769b375d91d7abe
font_02_sfnt_off00013a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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