Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f50a2d92d46fc6f…

MALICIOUS

PDF

90.6 KB Created: 2021-06-28 01:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9705ecfe6bd56d133009419a18a8b6e SHA-1: 6dfaafe968b424a4e44683decddca2cee985a66d SHA-256: 6f50a2d92d46fc6fd53b233fc66d5f847e4a3cfa9b713d445342c5c4966f4573
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting a lure to download further malicious content. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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 http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8b2e3e590---rilabimudevu.pdf In PDF document text
    • https://cmoretv.com/userfiles/wamivikiwewuleraxe.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad1bb7c1f8---nazigemudotu.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/buxegoxapevuzerasateveti.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/uouqk9stu2rtjap7gs1aclnet7/70583329852.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/xikifilijuvegefotuda.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ebb5dffd4b79b2444c4c2c3ad521437a/kusamixopezixototariz.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/59668537059.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/13210791230.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/buecassnfs35s3i5nclrufdjs2/27693562820.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16097ce62d7ed4---pefofavafojugasajuxesefe.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/298bef5c810607fa6cdaee2d8502631b/58215549281.pdfIn PDF document text
    • http://amdind.com/userfiles/file/dapedigigikowija.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/6or75915kugucri2faav5s6ng1/53502523016.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/53326276538.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4cdf3813---vizalemopuvutata.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ov90t47k4r9f89jeakgmsnikam/ruzewesamaxaliwipuw.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c514f899fd7---47325521564.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/99e029b388ab3f8cbc565ff07a78fe86/82343061364.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6e196d830---jutogepumoxajagovarumuvuz.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cpprkmcot4sngmmfg5ndalf0k1/75142006822.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8175ba0a3940ddf4aa481e9e70108a88/zajoreguviziwozuxisuji.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/68762185744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=government+paid+parental+leavePDF 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_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11733 17844 bytes
SHA-256: 9258c5c8614086a43f67d8924ca202e59e4cbb1bbb6de19ce766e382df053d77
font_02_sfnt_off0001453b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453B 10488 bytes
SHA-256: b4d019abdeccef95bfcac56d4787df150a4ac56e6027d6c9a93d03f3e1df56ee

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