Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61e4d7fbb782588…

MALICIOUS

PDF

89.0 KB Created: 2021-08-27 20:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8221ee45a459afa692a4b8d73eae19b8 SHA-1: 1ae559565a7f057642fef1cf1028dd7e4d6e1df4 SHA-256: c61e4d7fbb78258812063d18dbdf74f6a6346a99d9ad534937cca8729356a08f
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous external links, many pointing to compromised WordPress upload directories. These links likely serve as a link farm to redirect users to malicious sites, potentially for phishing or malware distribution. No scripts were extracted from this sample, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e822dc934d---xerikunuguwamuvusego.pdf In PDF document text
    • http://larben.cz/media/images/upload/file/xelikal.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c17c9e852---vuwurazozekape.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/626bb7fe7c6d8cce10305b3d74fb965a/jobasugupuresexinagun.pdfIn PDF document text
    • https://ms02bet.com/contents/files/25261431573.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55a03654d1---lijawazotisumoninatu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f095ece4ed0---58010900069.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/venemogima.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/17232615824.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee908d2acdf---kufoxuwel.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d6e62b5b15863b32b6f9e09536cd2598/31672420462.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160815028d5bad---5701914762.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/9e963200559a97c1dcd6098fea94620f/30578423523.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8c58513641b1bb65ce2a5328f4f2f822/56668662481.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/vorajuvaxolegeveresa.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/65131942143.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7606c7ad---95635513394.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/786633c98d99d582ef47045a0cac8dcf/11949999063.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/27739184192.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/mijatuletoluros.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/rizudomoburivaxofatija.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/35588b32ce9c25cc5aadf4d3b14bcfda/rafusobobe.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/fd9ff42f05c65ae0e887c99a79ce2c3e/93143662506.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16084bcf9d819a---56758255185.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/156c4f4f6e52e51c5c9a602e5cfe0212/63506624706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=commercial+air+conditioning+contractorsPDF 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_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E04 18420 bytes
SHA-256: 859f8929a272b0c366b741da616ff0843952623765736b48be682b06dc180d8b
font_02_sfnt_off00013da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA2 10744 bytes
SHA-256: f8e0699fbd17006893ea65f222aeb325a451482179a4960ee2da36a64e1fd1c9

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