Malicious PDF — malware analysis report

Static analysis result for SHA-256 11997fd5820aa640…

MALICIOUS

PDF

82.2 KB Created: 2021-08-24 13:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 346b2a0cb723cb9100822afd16ca8f16 SHA-1: acbb6c5cdb2bbfe5ee867edf3b8caee91e2e0814 SHA-256: 11997fd5820aa64068d27a3529e3cc398454588f805bac6054eb01305cd77345
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues about the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allytemp.ru/uplcv?utm_term=a+new+earth+table+of+contents PDF link annotation
    • https://x-software.cz/data/file/xepuwa.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/29299141617.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/4e2ed1581dc6e8a8e268c11f24a7f980/48680722941.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/89852548345.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/zarotaraxitevetowo.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/88295444994.pdfIn PDF document text
    • http://cosyromania.com/media/file/pudaluxexapadoje.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abed2d58f11---bogan.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/39194263329.pdfIn PDF document text
    • https://tsolisp.com/files/file/tuxomozesenekon.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/59101549524.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/873f63ecce05d0e1e3dcd0ca2f65050d/99263788660.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/3b3e32a5689edf84b7ea3125d25f12af/nefujidazewadake.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/71783010606.pdfIn PDF document text
    • http://humanlitech.com/files/files/66017374309.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/sipazolo.pdfIn PDF document text
    • http://gotween.com/userfiles/file///koweliwogemebopisevejadup.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/2a0136c3c01949b89b3f6e85e29271e8/94772603319.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/ruvudaz.pdfIn PDF document text
    • http://keralajesuits.org/userfiles/file/bomalafugowasudusufa.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161182ca0e3f88---lolulenuxurakobuw.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/xinexev.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_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 10548 bytes
SHA-256: bacadae79feb636279f834f377dd019eb47834361e5a33790692cddcfe75b908
font_01_sfnt_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 16732 bytes
SHA-256: 6956a674e11f017b33156e89b76857c0158c4aad01226802431858d16cfdca55
font_02_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1