Malicious PDF — malware analysis report

Static analysis result for SHA-256 d954913d7c263cea…

MALICIOUS

PDF

88.7 KB Created: 2021-07-04 14:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 687a532a2af70e670c657b846ea75b09 SHA-1: 52e4a699faa54574915255d8eebfb925640c0787 SHA-256: d954913d7c263cea5922bfecd58df6e8444d774292c69b973c2d651faccc4123
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm that directs users to multiple compromised WordPress upload directories and other potentially malicious PDF files. The ML classifier strongly indicated maliciousness, and the presence of numerous links to potentially compromised sites supports this assessment. No scripts were extracted, but the structure suggests an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/c84elu5di4fdhb5bjqn48ub41m/13924753161.pdf
    • http://files.ibiza-ferien.de/file/modolowolexozi.pdf
    • https://ludifrance.fr/userfiles/file/320677365.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/idfv7us58gotpglfgrb460tem5/62494238566.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/98694641686.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/63906748788.pdf
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/4b0kfga3pneb2qhbbhnan2e28j/zisugegexekegetofitasawa.pdf
    • http://wannawwannie.pl/userfiles/file/sodifopezupamurope.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faed07fcdc---29939128926.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/7rdlpggrhj3o39dmjgm790vbcv/74866614497.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bbb2c0e0757af3309c0de4780ffb9237/58635454485.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/15e13002c86fbb50f35a826aecd2f41a/todelusejanam.pdf
    • http://mrsgladysosei.com/clients/f/fd/fd76c46f75d01f7adbe86f52c2a5b8c1/File/ledelubuganovavuxur.pdf
    • http://ahsaipu.com/v15/Upload/file/2021522146129541.pdf
    • https://hostingalani.com/calisma2/files/uploads/biwowuputebiked.pdf
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/jifuxapo.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806bfbc96b4---nerepuvipode.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9e65a54b0---xonobopuxogidubajab.pdf
    • http://maasmartcity.com/userfiles/file/9580548830.pdf
    • http://short-story.ru/upload/file/39895238311.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1430bc8c16---9454665297.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ed9048eb2838dd8f6a1e9c70b7c4ddcc/28784983190.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/22bca660dd8a0b1fc344bf6c46cc40c9/61380013867.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/bc4f743da1ddd03e03777a370984bcee/69164204590.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+kinetic+energy+k+of+a+particle+moving+along+a+circle+of+radius+r
    • 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_off0000ed71.bin
b39bfc4d9056427c5111ac74960028741d7d1147584993793157fdc7bf9e5f74
pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 19008 bytes
font_01_sfnt_off0001204f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 16792 bytes
font_02_sfnt_off00013866.bin
e59e05a6ccc50545c8cd1af88bb33f90b3c1796874d5cf37dec853a649e04469
pdf-font-stream PDF embedded font (sfnt) at offset 0x13866 11400 bytes