Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc87af038f8c8d8c…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 05:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1cf8d09c257ba462f4570046ccccc71 SHA-1: ee445477c9183e377c1687ec51970876b5af0800 SHA-256: cc87af038f8c8d8cb6f83b0ac4949bd3ef90db3dc876ecb50b41abef265c836d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=best+free+video+compressor+for+android PDF link annotation
    • http://stimatacasa.eu/userfiles/files/94180702755.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614047db81a86---zeteku.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/38410085740.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/94070007106.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/zakoxulirewotefokuza.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/69034193bb250ef022d4022d3cebf926/58245437119.pdfIn PDF document text
    • http://orenprom.com/img/account/file/14750389168.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/renuwubo.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/xejojifigupalasum.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/20955877937.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///50845842609.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/segumalogurarav.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/43949864637.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/45302926567.pdfIn PDF document text
    • http://www.bash.cl/media/file/jinorapepotopodalifajal.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161446d47cbcce---tewonukuv.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614547abea4ee---96267596185.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d466cf9d1---33990542048.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/bomara.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/63792451668.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/dujuluroruxajunaweret.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/82152733753.pdfIn PDF document text
    • https://0900107678.com/upload/file/30031092427.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/gobafaguruxajifukotevu.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/fenubulalesupi.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_off0000c4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A6 16660 bytes
SHA-256: 9426ef2dd4aaf4a477d23d6de3898769a3633475bc8cd430701a958f5ba83cbd
font_01_sfnt_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 10852 bytes
SHA-256: 3792e1a1c5ec913896ce5e1fc2784c6a903bdabdf7b1fcd012a9dc727d9bc230
font_02_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.