Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b327ddd4e690e7…

MALICIOUS

PDF

76.6 KB Created: 2021-07-31 04:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa96ed42aa16ff86ab3315a3560d0c99 SHA-1: 8c735cdf6f57da798f1a0bf8dda0a59d635808ba SHA-256: 93b327ddd4e690e7c139ea0dfff34ad507e2638307e9deadb0cec945df48ded8
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the presence of a link farm is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://medvor.ru/uplcv?utm_term=saks+5th+avenue+vendor+manual PDF link annotation
    • http://fullcolorspandoeken.nl/userfiles/file/davap.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e6bca76f94a58186eb46e66c2005fa02/wapitefaveg.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/kiwofezuropanulig.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/fifijo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/abb859b401aae589cef67da16562fe24/mosigowa.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/9ec5668eaa799ca9039fa2225994e137/2752204723.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/gikariber.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acab534d4d---mesirov.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/36311807201.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/gaxewonelirivadokaninum.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/zobokogelugawid.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/323e34416858a5d104a8b50a0472a1d9/bezufepiri.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609668ec9ea5f---xegivawategejoxinuwakiw.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/93764643437.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/23416020375.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/wenabalexerale.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/72701835888.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b772198a5d---10506466674.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/dfe8a1cda766dc28da5c5b8935e6c6f9/sosetirerimawenumoku.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/29ccb698e2fb7b09d8190e9b16a150e7/90171153373.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/74rg2uclfr7026dij1mo659tsg/gulawamopetuguxidomobi.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/mipazivavigipiv.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/1632392635.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29917f0479---gobimabofovunatu.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/df4310fh4g7ndequddcjoe8l01/fivor.pdfIn PDF document text
    • 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_off0000c11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11F 10888 bytes
SHA-256: e18da36f1db3b801d06c0f96f628307d040e71d8192d9a08c0e9ad8d47fa355e
font_01_sfnt_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 19232 bytes
SHA-256: ab29efe073771b5706e2d87274438bfea6a2a3574e2e12164d342fd051eaab2d