Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27d2d636d81046f…

MALICIOUS

PDF

89.0 KB Created: 2021-07-04 19:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 635701ec80e4e749f1f43478ceaec0a3 SHA-1: 13b3d5523e2dc47e2dab43b1ee293631bb05d248 SHA-256: f27d2d636d81046fc4643941d8b4a1b3f2602c4e4276e464adb3a9ae088cf71e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains a large number of external URIs, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection by security tools strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/uplcv?utm_term=manual+adobe+audition PDF link annotation
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5468ef0f6---jivasazarujeve.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/m1aoqv2fb2us7kf7671uli6lv5/bagativolebowame.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078096b6dfc7---81338295081.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/5m1o1bacpe5a426jkj95f82r37/18464087803.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/80b8b762d675faf3051e09974f634f2f/wotopofisusobopisebebidaz.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/35105630328.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/76005259015.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202107011557376422.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050909523173499.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/23103151023.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/kaziworalosilajisoju.pdfIn PDF document text
    • https://mnlex.it/file/30187316228.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/todowapasebefupodirepi.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a27e36c60e7---14506810764.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/db43efb71fdc5ba7497f546c35356b06/ninufefowafajoregakuz.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/38000918967.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607778f6494b2---dapikanivanegaboxazigew.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160725173861cc---79046134569.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/vekiredukezaxad.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/l41fovs7asrotu1tcs17g2s1rf/74161702425.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/kakunawedipewin.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a829321037b---metodozofininowakipopebut.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/59407232389.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_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 10204 bytes
SHA-256: 4746182dd6cb77a013174d51ff596b9b2a42ab20d1fd334b1f48c9f1859a739c
font_02_sfnt_off00012a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8F 16972 bytes
SHA-256: c4f4c8afe098b0dacacd7c0b796e676974486e58907a730662c4e5db18be6bdd

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