Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75b68bb8ed7550b…

MALICIOUS

PDF

71.0 KB Created: 2021-09-02 21:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cab525b4c3bcf393ce1b02ba1d1a1a09 SHA-1: 73922f3dab757a650eba59b6becd33134e868eec SHA-256: c75b68bb8ed7550bed79173bb5ede788dd78ec49fd801b6e54f73612780b7592
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, with critical and high severity heuristic firings. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bc660d398---14982160998.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa49d6386ec---xorapasisabirupilazunip.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/rorifugabifaletufaxiji.pdfIn PDF document text
    • http://intertravel.hu/_user/file/25375075622.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/46556362792.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/wowutikubovivununi.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/sejekeramu.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa674ae462e---95644523730.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/sowutat.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/b8a5a8d6e3153660a5e80e2075e9ce81/xufevijebadifij.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/37214219406.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/3975b29536a5637bf44cc2a6e0013050/ziwitenekinisavivoduri.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/12483309016.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160de5ac4dbf98---suzumofumekavot.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/79926341071.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/33259205243.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/ramilorufekumuzusebuwiwus.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/fegafuteko.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/46821355823.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acd64f892bd---77650611642.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/lowijizuwem.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/19727528386.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/df480664258c530a4c93f629b90a58a0/78520537817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+solve+rubik%27s+cube+fast+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB591 11016 bytes
SHA-256: c21899c41e9d8991d6eeee30778577372641111defd786dff4b86bda8d1dabd2
font_01_sfnt_off0000cf32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF32 15636 bytes
SHA-256: 6d2b6b4a0924883dfba6aa204d4ca94a613d2d37cdbdafe6842f4983c1344d9f
font_02_sfnt_off0000f68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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