Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f31575a58c630c…

MALICIOUS

PDF

97.1 KB Created: 2021-06-29 13:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 14b040096ce67c6e62f03641c3537b6c SHA-1: 4831ee66a10c0d7a389dd6e29aec067ce2381a7a SHA-256: d8f31575a58c630c4eae4a59c10dfef8f407e10e9f63540a108d83b4a3bb3085
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or hosted on disposable domains. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect users to potentially harmful content or phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 5

  • 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://songhongresort.com/img/files/saferalumudigugomenaz.pdf In PDF document text
    • http://meta-min.com/files/xejomutotisijulesit.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ecc74b91b---muxibesukuligeve.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5db885f6ca---87006036238.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/aa8ee8fc08f5198afbdd6e32ef2c730e/67176285594.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/918db332a9553dbbe84f4e0b6be75238/23135324447.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607172182b642---worapiwabezenigaberu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7df0fa8dcf09402e1a32d9191a6e7bef/zekeguxalamuzowajine.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16072e37873f41---35614125113.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/79551342165.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2202166c---88413135956.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8757721b7ca56ae51a15eb1a6fa2156f/xulajog.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/95100757379.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/kutozerezi.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084fd66e9eff---14803235108.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/95206850112.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607adcdbbe74a---63236013222.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/72149486647.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/67696699754.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607000f5432dd---rukuweru.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/65okngpo0jeo2kbe3kiucrgnp4/94067601853.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/zakilufapivazugurog.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/rovakilebamet.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d3a6927557e34329d0f60dcaa14e199b/38458688191.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/f8819709533155ad218ec2d8790b20f9/matigazexulesoxamedeme.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ub8rnvlg6a4q0sqcmafv5ra3f2/tipabonakufowoleramazadol.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd529867d68---7799474102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=introduction+to+photosynthesis+worksheet+answersPDF 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_off00011489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA0 10908 bytes
SHA-256: fe3f55cffeda801a2fb93b72de99d7847abd691f7fd7585384ca895077d420bf
font_02_sfnt_off000145ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145ED 18476 bytes
SHA-256: bf85e5b2f3a8c49d99ff3cd92b70a000b5f99934f119c763e44b1ac4b6caf75f