Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74ecb3eeb9e570f…

MALICIOUS

PDF

96.8 KB Created: 2021-07-13 19:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 220b96f24bcc65d738894c25027c1a4d SHA-1: d9918da2a76ebef044700ed272c8877092bf758b SHA-256: e74ecb3eeb9e570fdf5a756c9b6746c0ee9e8fbe5728d2ca3b8e68e003e2734f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=types+of+unfamiliar+words PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55be032847---92160292025.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c9d285d43152b4c0c0be3dc38209417e/sapotutiti.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2b7d452a3206bc5cce1f6c4f0a91126a/gurowalezawubi.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/80368391408.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4987ac4c2aa61204662b6793339b593c/6244660003.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eacdd67012---22669090720.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adce546e28d---43687819020.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160837db9a3ca6---44895973614.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/72935996092.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a4b4a0f086e05b9a3476dd1aa65cd4d7/68518155684.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/misiwezutol.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/4643411619.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/89957006292.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/38031569666.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/23691805698.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c2764f171---21679212628.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/d50c5fsicln55lrb6ppjtbia5h/makozazufemelegexaw.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/958693242.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f167aa6d---45276802422.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/e8fd50tcf9jhac0jhjjadh2fj9/bobamikizupebenajugabitu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608816c091321---40644307180.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/luwosebumuj.pdfIn PDF document text
    • https://dptech.vn/uploads/files/waperojizokononotu.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_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 17360 bytes
SHA-256: 8c9531f4b78144915cb9c423e8513089720f92ee8e25d7a5d3eef6a38b58b933
font_01_sfnt_off000143a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A1 10824 bytes
SHA-256: 71dedd308afc16ff73837a0f14667d52555d2f3e6ba0354e97f0a697e0e492ed
font_02_sfnt_off00015ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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