Malicious PDF — malware analysis report

Static analysis result for SHA-256 3831d8fb2c541fd7…

MALICIOUS

PDF

98.5 KB Created: 2021-07-05 05:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7cd7852789e31f6fc568febbc7126f1 SHA-1: 84d0983a81fa8b3851b83ca62dc95613a91c49ec SHA-256: 3831d8fb2c541fd7a178c8790e5f818b1706881b3275d9a89193d734987c4ebe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. ClamAV detection and ML classification confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://leesman.com/wp-content/plugins/super-forms/uploads/php/files/2c33ee62a1d8a6d6e06f86e341b27e91/24979550880.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160796cf364564---62498922511.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609838f51949d---gesusovinezod.pdf
    • https://vmwarts.com/ecovic/file/lufedokezujiziwoxanonuniv.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/6a9me3e2lb4vr0flpqejs8nh3k/xekasuwurorabugir.pdf
    • http://amtutoring.com/clients/865321/File/46070497399.pdf
    • http://jonme.net/ckupload/files/tubuxebuwoduboni.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/9369351542448fd24f79cc86e7550d89/30078896418.pdf
    • http://retco.ge/ckfinder/userfiles/files/kulawafevezizeruwodumixu.pdf
    • http://naturalmis.com/userfiles/file/posuwojimam.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/gdur6fj6kl1qbhrfej6muuss1u/50732830559.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21215339ae---kadab.pdf
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/vojopadafulabijugilaxaro.pdf
    • http://seoulsquare.com/userfiles/file/wolenudegizugigirag.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/fd3c370bf585e7826f24af5e518b20fb/32409700807.pdf
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/furavalev.pdf
    • http://work4shop.cz/userfiles/file/84265901911.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/tenefebomizojexowadumom.pdf
    • https://turismo-galicia.es/ckfinder/userfiles/files/wapusafoloselaliwipebeve.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/64351596572.pdf
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/89006060127.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/1cd16f7eb26be92897d069b25a669cfd/21898998006.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=immoral+traffic+prevention+act
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012148.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12148 16792 bytes
font_01_sfnt_off0001395a.bin
a18b1431f36c8846d0b4f5aafe771067b7597ffe029e302600f626544f67f6d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1395A 16992 bytes
font_02_sfnt_off00016604.bin
1495b73cfdcfbd1ab73c54c6a1c9ff6b09795babdc6dced09cc41bb360dd7873
pdf-font-stream PDF embedded font (sfnt) at offset 0x16604 10492 bytes