Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa73d0dbae0651a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 04:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13724cbf84e5713dd6414be7ff6e9fbf SHA-1: 36d506465e2368ae3f1a12c66a7e4d78aa2a65d0 SHA-256: 7aa73d0dbae0651a7e3bf1d18e801f6e12785b7046b63cad91d2f6a7dbd9842e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, including those pointing to compromised WordPress sites and link farms, suggest the document is designed to redirect users to potentially harmful content. The presence of multiple external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=how+to+get+infinite+robux+for+free+2021
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139de62c9ed2---zakevugipuludakubobu.pdf
    • https://hotelite.in/userfiles/file/tavufinav.pdf
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/89013533406.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6025e726a0e77d5d77aa11c0e27d75a0/71239462537.pdf
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/nakuxi.pdf
    • http://glassick.com/userfiles/file/xokojutidudazosoked.pdf
    • http://villaroyalenews.com/userimages/70352736379.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614655a670899---siripudik.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a600655c15a5a5955a7972185a583afb/47361738640.pdf
    • http://agriturismoilnoceto.com/userfiles/files/sesimobijodasi.pdf
    • http://mislenyiallatorvos.hu/userfiles/file/68651723876.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202109131633165947.pdf
    • https://matkinhantai.com/luutru/files/25054374431.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f53bef11d55634fed144dcf7959d40b7/42979400647.pdf
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/6483396320.pdf
    • http://sun-green.nl/ckfinder/userfiles/files/lunaxizage.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc451e3b96---68268340871.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143e67b6ae78---39411163309.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///73564160306.pdf
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/48311805536.pdf
    • http://yarpb.ru/pic/userfile/kemazunubopo.pdf
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d1845ea6c---72369438738.pdf
    • 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_off0000d995.bin
100c1bc311b83b3d56ea68ceede38982db9ef63b59f5b34f7462497da0e16f79
pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 18612 bytes
font_01_sfnt_off000108a5.bin
5d3f29d54a3851dc73c0464e1aeb8f06ea483ecebd593acc593e15740e44cb1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 10728 bytes
font_02_sfnt_off00012186.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12186 16792 bytes