Malicious PDF — malware analysis report

Static analysis result for SHA-256 11eab31e2d225013…

MALICIOUS

PDF

96.1 KB Created: 2021-06-27 23:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 093c383d5b1e8a1e86ad040f98b8cdef SHA-1: 77cb068562d36adb016be51b6a7090f8f7460b8b SHA-256: 11eab31e2d225013b107f22e9806c1eb843b0496b48be678bccaa70547d13ce7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external websites, many hosted on compromised CMS platforms. The presence of multiple URLs, including those on disposable hosting and potentially compromised WordPress sites, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://philabc.ru/uplcv?utm_term=design+and+analysis+of+centrifugal+compressors PDF link annotation
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609c336d1275a---medezesikerusam.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/76811888194.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/08d6b4d0f2efa9c845481912edaf144f/bodowukoxexepisese.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/beposakidugunepifozi.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/vuxefisepudir.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608336884ee17---vamejetupivarosadukudimu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160964be066780---59983091867.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/5155058776.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/41461103571.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094589241c34---65062896880.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608602c537230---japaropulebanutosax.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/nr6cnqq1hf36k9dnk5bmb9qnns/66203164277.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d061d4ec4---sawamegitepodebixuko.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce116e19d5---ninapokusidupalijuxupov.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/75290783546.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/kr2kattkkdelt63qovgvq0ve6k/zawad.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/5fa5on830bs65b102ojo8a374l/baworapuzuvepabuxonukik.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/xawapi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0764bd506---vewogugumusagew.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/lulego.pdfIn PDF document text
    • https://teyadegitimvideo.com/calisma2/files/uploads/bazaxijodoranalubupagele.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/bogidusenafinozikejux.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/3cupkn5cnifvhgqoa4u65paa9v/8319448268.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a393308e78d---41789603212.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/wariluwixomugosanupo.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/a3gcjeoklpumik14kd9ela0l0u/27053740881.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_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 11180 bytes
SHA-256: a5e7eb29bf7585646ef72bf06cd46808a3a179283c439ce42f1f69e316afdc5e
font_01_sfnt_off00012ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB8 18460 bytes
SHA-256: 8ba2522c35506452eebb0e948549de37bd95ee954bff68f2052e6e8eb9573da5
font_02_sfnt_off00015a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1