Malicious PDF — malware analysis report

Static analysis result for SHA-256 10068d81e42dfb78…

MALICIOUS

PDF

96.0 KB Created: 2021-09-02 18:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0e38c49ad1ba145530a3bfc54976b10 SHA-1: faf7374132300b500709eb49e0da67a21e67e272 SHA-256: 10068d81e42dfb788e7873c3618c9655bd7ac0bb90bea67ddf93e6b30884eee8
84 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URIs that point to compromised WordPress installations and other domains, suggesting a link farm or SEO poisoning tactic. Several heuristics indicate that these links are designed to lead users to other PDF files hosted on potentially malicious sites. The use of external URIs and compromised CMS uploads points towards an attempt to distribute content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4877

Heuristics 5

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5e1ad7381127471905da7dce5a840644/18364401369.pdf In PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b6449e45f48---kevojorinodanozizevowoke.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610133a2f34b7---ranamujovizinizu.pdfIn PDF document text
    • https://majubesar.com/contents//files/29212281937.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/89opl6ed9d15k2pqthlithl25k/33059878109.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16098843fcc8d4---64393156387.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/marifeba.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210804_CD054A72F0577A06.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0869d05b6e8c6d89b255b33fcb5070be/55887997089.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b30b1fa290a---90323777564.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d03924f953---26989500311.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/zosuxepapejobidanuta.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/97834768572.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/vajobixeguzitogitu.pdfIn PDF document text
    • https://gilbertems.com/videos/file/relakovowa.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/fabeworisuxev.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/40833135449.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e05be642---1836701084.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dfa52baca---5143284433.pdfPDF link annotation
    • https://banderlogclub.ru/Files/file/meweduwomurifabimilawonob.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/rimenix.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2subaiutcr9jdigshp31t7c5p2/5668804747.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/refenosugosir.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/38637532494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=nerves+in+human+body+pdfPDF 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_off00013b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001531b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1531B 17848 bytes
SHA-256: 4cbf7925da12d3de38980e02f2c4349247940169219e012380ed4f9dfd33e888