Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1adb4157841229…

MALICIOUS

PDF

86.7 KB Created: 2021-06-30 07:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df61dcb24e8e5a2d6ac8d01b6478d31c SHA-1: 43c3f0033dd53b53aa9673df6d1faf01c3148bed SHA-256: ad1adb4157841229e905be30051e0d11d31df5a515108a74711466c2fdae4d98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03a08254ba---sesovaze.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e27c33507e5889123420655f82e4160d/tuloxelaretuwew.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8dd965273---42938545171.pdf
    • http://apexibd.com/uploads/fck_uploads/file/pasirotodudib.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/57179966480.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/qckf0g1runkeg3arnrfh4kgqe0/zalenogegu.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/rg8hnpv3bkkf33ekfe3g949ql8/84536016452.pdf
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/67950200382.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5785e9d7d3---xenizusibigoposelo.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c087ed6fcd8a64865f85cb6094e5f5a2/zetunujejinubupifix.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9j6esl8e5532tsbaed265s880f/10340214660.pdf
    • http://tantos.jp/js/upload/files/dafadobimegota.pdf
    • http://alibabashipping.com/userfiles/file/nesutakirepedubuletas.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47098765519.pdf
    • https://vmwarts.com/ecovic/file/pepomuxumimumexiwezit.pdf
    • http://www.lnk-creation.fr/upload/file/15245619341.pdf
    • https://luyenthitoeic.info/userfiles/file/vofefilab.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/39598729349.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0685d8833af7659ed65acdc081b9543a/nadukofexoxubomukedite.pdf
    • http://jhferry.com/data/fckeditor/file///dezirigokoxezubiwajedibi.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/2vfa5lp3knuf0a0tlgqvudn72r/bopigukoz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=can+couples+survive+infidelity
    • 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_off0000ef20.bin
a6a03d9031ae8d481659f90cda751d5366a06d635cf29d1807ce12bd39e6adb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 17352 bytes
font_01_sfnt_off00011c4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 16792 bytes
font_02_sfnt_off00013462.bin
5c80f56e4b85869ffd53d57fbcc3c5c07af3c2a099b9100419924160b31cc34e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13462 10924 bytes