Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68959537c8d508b…

MALICIOUS

PDF

98.4 KB Created: 2021-06-30 05:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8a1a569114553b41710092a57f3042d6 SHA-1: 52243bff9e9c31b952905128a2d7781a0c3f782f SHA-256: b68959537c8d508b56b3728a6c43e656ba04f52272f67e29f260e6d0efcc2726
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a likely phishing or malware distribution campaign. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the structure and embedded URLs suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://momsystem.ru/public/file/bapajobamigopegokedaz.pdf In PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/944b1vaf62udhcjthm0hkaprsd/6707137354.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/08f90356ab2950db5195b64ba26e45c0/39097006953.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/gikoru.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca1a6de661---38832994860.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d3d8c583950d77ab099535ee025398f7/xuvimanaz.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///58109729031.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/3fe12b28b0d038136188a4fcd9087107/vumekurifilofepevi.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4092bc74c868b3c12ed452453dc016dd/93183826524.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/75417204062.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/9e41889bf17d94874cffc794ae6236e8/xejikafavitalevafax.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/llf6r269d9map1fj4fdau2jsn9/jebugasafalugow.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/c372811990da1216be9f1eec902442e6/dajole.pdfIn PDF document text
    • https://kuepancong.com/contents//files/75792795015.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb014251147---4834149136.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f5920bd19---bujevevafurefuwigukuxu.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/21301647825.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cni6kkd921ukctaqacs79tgg13/kuwigazirelupazavo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d92383a5dc3---betolotumoditosil.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/92026401584.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/zoredopifedunokur.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/3bf5b17b36c3237fd728983e7f886be8/vovozufixeduxozanilokabab.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/mrjl1rheml0qlqnmhummr9t5i9/kinikasigizobapigafu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a71f826a01---jakonigosejugomuxu.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/36367528087.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/22826534774.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3fdc91fa---26122732718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=star+trek+the+next+generation+the+royalePDF 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_off00011ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CA 18492 bytes
SHA-256: 32f4f2f0ffb4554770711fa8bc0f019fa7a19f17df66d5d0d928584cf1370b5a
font_02_sfnt_off000163ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163BA 10604 bytes
SHA-256: b78cfea43a401805f50b3539e937dc249c904a9819cf38295cf84ac76fceaf09

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