Malicious PDF — malware analysis report

Static analysis result for SHA-256 8adfa514a40df166…

MALICIOUS

PDF

80.8 KB Created: 2021-06-25 22:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66d7fd9ac9ecd710b4b1f382745f45c7 SHA-1: a9f3d9df36801574622de6dc197d78e315b35a2b SHA-256: 8adfa514a40df16629d268db01187c0b9d04d82fe140d7cd18b10ef5e06f3af8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites and disposable domains. This suggests the document is designed to redirect users to malicious websites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed4b7c051d---semudokewibilatopo.pdf
    • https://abofahed.com/userfiles/file/57729704719.pdf
    • http://marketypik.pl/zdjecia/fck/file/3758247460.pdf
    • http://wych123.com/upload/files/81734866337.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609219fb33267---rabomowosakamenotilavaru.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c8b129898ecaae77e4b80845a43a48c4/vogefojumovugugatisosesog.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7efb60a39---fivekupomom.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/60700586647.pdf
    • https://soyana.de/js/ckfinder/userfiles/files/39498242203.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4bc9ada94---6334992863.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b994dc4cedc---61573256359.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed59bf2a77---50541998469.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607df32b6e6c2---62533212194.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/be6ea05d9e471f4ff24e576c63b84c4a/70337092156.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/282f1ee3caeafe0bd6704f33edfd3828/duzipodagubejatikuwazutu.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/88d2af00b3e86a5fe9e95dd2df1cc9af/papowowon.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0f54bd55751bdaa45b83aa66a92085ee/samedunotodex.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/g5atdbonn0k6q537cp36bkpl17/57048710394.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/666645f93094a116a37305d7d2145c3b/92248165190.pdf
    • http://weddingdiy.cc/uploadfiles/files/20210608_123656_9741.pdf
    • http://ural-resyrs.ru/data/file/wogukevizumexovepe.pdf
    • http://szao-spb.ru/images/news/file/59857769392.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+gcf+of+4+and+7
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b0.bin
4016371a7cdad733d195f37534ac75ada78610288d5b0c05954d2e9f5bcc34d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 10728 bytes
font_01_sfnt_off0000f238.bin
cb8f76481e6efc7c96cb2cc615efdaaf721cbca698126b17949fdf26323e5001
pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 16936 bytes
font_02_sfnt_off00011e00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E00 16792 bytes