Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e66eca5af995d6f…

MALICIOUS

PDF

95.7 KB Created: 2021-08-12 18:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2dc5d44084146d5887f17eb362d58fe3 SHA-1: 54094b6a2e79b008425dd8077b4d747b7d0f63a8 SHA-256: 2e66eca5af995d6f28043a7735d15d30fa6853c5675c4a468c583bafda30547e
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these links for potentially malicious purposes. The ML classifier also flagged the PDF as malicious, supporting the assessment that this is a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7042

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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=pixel+combat+zombie+strike+mod+apk+3.9.6+download PDF link annotation
    • http://cieplej.pl/imgturysta/file/pipelite.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/fajejanipubipunupiwupipo.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/fesigoramezavefipixipis.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/ritenubibomekasom.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/226259882.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/xazatijot.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/repipeboro.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/59292629515.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/belamajomobutalax.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/80776220063.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/4585752564.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/fec684051e3ca49e8f45d238684e8147/mipexuwigunuzidozami.pdfIn PDF document text
    • https://paperland.bg/uploads/file/30274073049.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/nuzelupomaxukape.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/e90a21d3f4f658a6a5e49d1b2b8919ea/34566381557.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ed0ef93fc3c---4054632366.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/kixitiwexir.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/55969777037.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3d4124279---69874307853.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/42349383108.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/33037491695.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/19969987660.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/podcnugl5rc6geqvdh6u79ffa7/13644343045.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/xunulenujavixejipuroke.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/3fa6bb43e9b5be7f809ceaf6be8169c4/wasexijesobulufawagamef.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ag263gfl3727vaum27fp3m6q2d/gimebekudojikikokuwamowid.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/umuutcu0lqak900u1vukmpgq6m/lusipojovema.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 17836 bytes
SHA-256: e9d32370f952b40f13379108c0f4a1a19833107f4183898b5ab12679a177a482
font_01_sfnt_off0001340a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 11728 bytes
SHA-256: 408ea28ea78234de5a5894edb89df93134fa668020064cf4dced7ca48c2e056d
font_02_sfnt_off00014fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000167f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167F0 16472 bytes
SHA-256: 3eeca2e0cba229df837d555c5c119f1c64f28089b2a92bc0f990d9d6c20948d1