Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef962f117e3404b…

MALICIOUS

PDF

75.7 KB Created: 2021-09-06 20:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3fba2fe12504ded6af5f3fb5f1fe83ec SHA-1: 81b2fb9b9589387a68b6c806ae217cf4f687501f SHA-256: 8ef962f117e3404b8f2d73f52c0e8a6baa79e8b01a71509815eb1ac37b09075c
96 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 or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://tcremich.lu/files/files/84148153561.pdf In PDF document text
    • http://chinoboxingclub.com/clients/36032/File/12512729846.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/42563709594.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/90600223054.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf2d375a29---68809389772.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/35475465149.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a73119043a---67623590395.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/xodifasanoz.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kiluxesedexebinuv.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/falebugogi.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/31497193195.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/402ea8b0f975b1d7b6d0d5335f121f30/17685463187.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/kopajowasilujimeli.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/tonivob.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/lavutojokosepagimakefupe.pdfIn PDF document text
    • http://maihome.hu/admin1/file/86841608202.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/b5cc8b213e28a0e384afeece80dfcbbc/salev.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612a153436f9c---34991359096.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/6chnhkfasd7i17fo4tvgvf57o8/92890059877.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/19918615154.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/xewofipoxa.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/esb3kh4upvn0doahse8uknmslm/83056665533.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bbc8be169---xurapujabobe.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086387c37c51---dikoporixisixonefeke.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27618c777e---nadozobotagokutamifobe.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///67369046889.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c488d047197---novitiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=microcontrollers+and+microcomputers+principles+of+software+and+hardware+engineering+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_off0000c032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC032 11244 bytes
SHA-256: ae17af4c86319a71e688e07ef64a596ee0688423a12ed557f1735e881d35ca86
font_01_sfnt_off0000da3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3E 17652 bytes
SHA-256: 632872299e40db6bea7f1267130f3720d7d686871cab9a375b9bd91e12ba40c4
font_02_sfnt_off00010802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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