Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2721d26e384edfd…

MALICIOUS

PDF

89.7 KB Created: 2021-06-29 03:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d57c83aa626d9fbfb3e6a0e996cfc59e SHA-1: a0947adc038ac8cd106ab436cd338ceed7dcebe7 SHA-256: e2721d26e384edfd04fbfbb76b03a214dd57658d9b3ef16c70a006fb086b23fb
156 Risk Score

Malware Insights

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

The PDF 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 URLs pointing to PDF files hosted on compromised WordPress sites. These links are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/19616f552b2a191b4061d4d99b2298b3/tugigusufes.pdf In PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210616_D5163AD0B885B214.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1860aab47---30274440808.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085041fa6d38---jabod.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01b2b2e1fa---21041556361.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/vitedokeligiwatututukov.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621367204.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c461f88b82---30599166584.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/24e2bde49d4a9e26e9600b421a97f109/44152010753.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac18d3cea---worevigerisutaz.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/tasovo.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/59anc2bs98mmkh2fvelvrjhpb3/97009825514.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d670a40ac3c---gazajefidivopojiw.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c260f70d9a.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/80313664379.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/44c6a7beeec11b1e9de5866800dd0784/limojegunimupeve.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ab6ddbb46674376d6fa0d42604ca2513/xisakodepotozibimatafol.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/36ee2bab151f211521296a85538159f0/rafixakasap.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/rgoemivfq9q7gn7qg63qp48s18/26942113096.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/abjf32rickiab0ncfit12nbek7/40930592814.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/28280336942.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/df0d158ca6f60f777e6f586ad64d7fd6/xuwejubep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=war+thunder+french+planes+guidePDF 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_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 17944 bytes
SHA-256: 9ae4e26d124856a0fe0d149acef51f2c3859d78db8e706a7c10afe7af4419845
font_01_sfnt_off000114ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BA 10872 bytes
SHA-256: 5cd9fbd60bc6992f32d7cf0a8c123d4dbe659665622a4b133263a9a0d43b914d
font_02_sfnt_off00012d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001459f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459F 5580 bytes
SHA-256: 588651a58489c238b9005016cf3e50554fbb68b39504e1a13af1abeb0fa0c544

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