Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ba1c110a3f0f48…

MALICIOUS

PDF

92.3 KB Created: 2021-07-20 17:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ffb6cc5a410eeb31ced8c76cacdead7a SHA-1: 04233b9400f12a274d874399f47ee8ff5849ddf6 SHA-256: 70ba1c110a3f0f487ec1ef1214f9cbdafa9954509eef1a52b5db8c296266f794
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as lures for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://laatjehuisweerstralen.nl/upload/file/2708749851.pdf In PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/pabalulutofawunib.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4365581af---69821847189.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///86260610313.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/eaf008d3a4565f9da0313a92066e4260/67716898656.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34799f8a0---nivonusowifexiladabonis.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/poruteretemif.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/16158787977.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/80883634632.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076cf2f41d51---pinabudasukemefidex.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/122aaqv7fbr8dmbk1u51psfj6b/12641267365.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/defosoxezusazu.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/munujimatipizetarelav.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/79898751668.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/78877210675.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d1396222e---ketazakajarujitoruvipijuz.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160833e45928d3---13348058140.pdfIn PDF document text
    • http://splogservice.ru/content/file/76961561078.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/1316794692.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/sf92q6b6j5c90ej1sveapc1351/7983499376.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/19218950312.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b485b056f---melewozinavofinugerut.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210626142930_9n16nb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=madeforyou+remote+control+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 10584 bytes
SHA-256: 6559bd76a9f5026f85ff5338a171fc969ea24e30133ae58812de4c6536193dc4
font_01_sfnt_off0001070f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070F 17580 bytes
SHA-256: 68da6c68289e93c103c6fffe3087be17e28745223ae57435503949f9a2e33b4a
font_02_sfnt_off000134eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFC 16704 bytes
SHA-256: f3a20dd5e700ae390a0fe49f1c8ffa79b3fb96a0bd172bb38c6ac14fcf60674b

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