Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ba8b2fd6161ff9…

MALICIOUS

PDF

76.2 KB Created: 2021-07-04 23:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 67cffeeb5888672be190b81408a89c78 SHA-1: adce66e070618c3bfeb9505b6785cf3a12a96b0f SHA-256: 55ba8b2fd6161ff955afdca7cb9b6e95bec803d30468dde04d489a483b9f7fa2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5877b2c58---44940380333.pdf In PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/zizefamulus.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/vuvazoguwawenitufube.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/49827565300.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/mowuduvafowo.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/dd79c2970cd7a4842386dbd963684b57/1966662996.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/6179dae349fd1d1345c7ce806223096b/tanaxa.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/pewebanizufiv.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/zamonojig.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c028cff7c5f3c7516d191ad5ca2e02cb/15758584698.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f4563b0a---36326527315.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084006944e1c---wekadopobufanofirelugi.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b2289876a28---guboniwijuw.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/kizuropinuwamedelazuf.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/kisesokizopu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/018030d22618f9a0f23cd4f1110f6aea/zinenalovojime.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/61431425397.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/383824412.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/kseof541q3dt9gjik082nj90hk/libogavininimeje.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/867a30e0d7262f086d84d6ec659ec60b/80379153962.pdfIn PDF document text
    • http://hnspkjx.com/d/files/52368993730.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/zirug.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876fd3606bc---29491305663.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/r8fm9ohtrds5p1ub2o8kva0c1p/31301295539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+damon+ps2PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 10336 bytes
SHA-256: a5cce9d8edd8c47b2f41f6fe4e4b47cace3aa5cfe381d903d35ae9a64421b962
font_01_sfnt_off000102a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 17172 bytes
SHA-256: f918eb323dd0fcfcdad3a0be2f6207e73fdfe5c1f860c9d17796c7dc36f932ff