Malicious PDF — malware analysis report

Static analysis result for SHA-256 849886df6171b0f7…

MALICIOUS

PDF

92.4 KB Created: 2021-07-02 07:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 122532127bca08086e62541168c72c58 SHA-1: 49468da878ff8dadce877e51d1c7ac652c3fbe7e SHA-256: 849886df6171b0f7d0054c30856ed5abb3f36b298c8a03debfa0d141f7ccd937
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection further confirms its malicious nature, classifying it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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.
  • 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://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081fd9f4f0ee---52374264436.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/48fec4dcc05d478624cb6b8467c42a94/wexepepiwezivuforoduso.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c1c574f2765042c830fe1e9621bbf34b/gaxojegikilenuwodine.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160944e1ae9d9f---fezibivifakevizelejudovev.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ddedb1e6285d24d400993cf8134d3514/32698051565.pdf
    • http://mynigaoe.com/upload/file/20210511190915.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160738b5eed851---gefovanisewuzuzoxu.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/44fac48038782d8daee5776aadd18bf6/kopepolomepetumaletikigi.pdf
    • http://chongthamnguoc.vn/img/files/nimupedumaxivejiname.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/j070u33o0a2n5n4dbtb6vh5lbb/xoxunerovegolaruko.pdf
    • https://amursvoidom.ru/media/files/vaxuwetodejipur.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/bbcg52fiie37robhog0nfiqvcg/1139988592.pdf
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/92539068657.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/shb1mn012ci8jpfp7oukchmie0/wipupinukotib.pdf
    • http://mwflower.com/upimagesfile///26152723903.pdf
    • http://ubest.ru/images/file/17971227046.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac24b6b1c88---20003186816.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/edddb3d398f112162c9ee2d878655375/78422473343.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/da350895d44e0a5c16ed56638d30f337/93660628362.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089caa120b54---6182571054.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f5pi139heda91tqloegkeo6n83/36882352453.pdf
    • http://tplustech.com/images/ckeditor/files/tipadumelumaxen.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/18872641040.pdf
    • http://allaboutdowney.com/userimages/nosakozijuriwor.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=stylish+ppt+templates+free+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e865.bin
fdc4432d269f83f6ca095fa0ad5fa620ecfcc9d1d068e2d9c4e1e181f8370de8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 17936 bytes
font_01_sfnt_off000103e2.bin
8318595b1ba9021e86d74961571cceff0942ea61572e03e8ecde188a9c77a8d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 17500 bytes
font_02_sfnt_off000131d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131D9 16792 bytes
font_03_sfnt_off000149f0.bin
0ad279f1df733344068b538b1701b55bfd39d613b10fb50bbbe60b2e39a7f182
pdf-font-stream PDF embedded font (sfnt) at offset 0x149F0 11036 bytes