Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffdcaf28b15fe50…

MALICIOUS

PDF

83.6 KB Created: 2021-07-20 01:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5bcd9c80f60818b37facdbdea08adb6a SHA-1: 55b52fa1767a2c83838985a4ac07be35cd76004c SHA-256: 8ffdcaf28b15fe50e9b36ee4e5ca04ffe06632ec599183766347bb5082faae54
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage, suggesting it is part of a link farm designed to distribute malicious files. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a fake invoice or payment request to entice users to click the links. No scripts were extracted, but the overall structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21ddbede8c---tebarumuwipudarabixagipe.pdf In PDF document text
    • http://ropesadventure.com/d/files/jobijuvubenafa.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/99550493165.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609128ddc81ca---wemapufedube.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0c2306b097c42efe5f2122fa0ae9ad0f/verunevujos.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/875d4890e87f382a8e374b3cc9bd4344/satefidukojipuxan.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d41471e9ede34b65ce5be2363299018c/51601685937.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/fejonuvasidudasi.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/sosodokubifanulo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/mploiuo0521c0d95n7hpf513dk/dumomukajolibiwipexi.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160986dfc98339---rotubonaxetonunusavapoj.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8353c7107d---87617215471.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2054be6082045160234b2cfd23dc6fd1/bimazagowabogud.pdfIn PDF document text
    • http://salkim.com/userfiles/file/99772846441.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c415d453d91---sizerurelovar.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a8516df554c1395474af3648b3163e2a/fojevivuwawalolikuz.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/978fd73c122840b60763b4cab183ece4/23248022026.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071434b03997---23658744628.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/72198563483.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a13bf785c286f5d0682818fa66f27b7/90900275441.pdfIn PDF document text
    • https://agatanorek.com/files/file/95855519571.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/guginuxesorusofofow.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/46195254927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+the+difference+in+subsidized+and+unsubsidized+loansPDF 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_off0000e43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 16604 bytes
SHA-256: b7ab441a0c0afa7b3bfbb5d08bf7866471a16cffc9d09821bad64217a63725b0
font_01_sfnt_off00010f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A6 10864 bytes
SHA-256: 6a5701869ce3386ef5b2564755da9ce6416579d91e37045211041bacf03b1914

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