Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6e3170ecb5da6f…

MALICIOUS

PDF

88.8 KB Created: 2021-07-19 13:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4a6ab6d464373fd48bcdc773d041c037 SHA-1: d774e47c62e0e45326d2714ac2b795619bc2ee94 SHA-256: fd6e3170ecb5da6fe3db598c58e8d0c09085fdca7549d693c26591aba5d6152d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains multiple heuristics indicating it is a link farm hosted on compromised WordPress sites and disposable domains. These links likely lead to phishing pages or malware downloads, aiming to trick users into clicking them.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4702

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/406795367ba9ebdb7c8978981b811d30/fizajiwowedid.pdf In PDF document text
    • http://short-story.ru/upload/file/87965613286.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0159465eef24d70aeb858b69f74da273/30824250596.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/jatumitumarozazanafopovun.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e878d3f8aa---58658244563.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/31808582285.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbafb6bac2---pafiwawexokaxerepedo.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfce8129a0---ruwise.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/aa475nbrkr19enfr6md0eht8bi/38915537405.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/37781960902.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/4254162954.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/b6655baf3005c8a9c92dfb42bb94b977/5571047927.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f862a77af5---13117918610.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0af64981a6---gadoxis.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/tikag.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e613c84e28d---29596511718.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/99572997970.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/t8birikuj1f9ku9mst2lturas3/75902570741.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2adc12924a---dupape.pdfIn PDF document text
    • https://digireg.cn/upload/lofur.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/wegogozapeguxesakefikave.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/bifetas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=every+time+i+turn+my+neck+it+cracksPDF link annotation
    • 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_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 10580 bytes
SHA-256: 4e7adfe1a163e95096a747ef63f1423771abd397255ed9394cf2a5d3f64de4db
font_01_sfnt_off00011a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13287 16532 bytes
SHA-256: 1d16b8b6a75083e7d38766ba97d3718fe489a245c29c7ea7d4f2c166d71f16fc