Malicious PDF — malware analysis report

Static analysis result for SHA-256 3862012ed21366fa…

MALICIOUS

PDF

95.7 KB Created: 2021-07-20 02:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: aacb89ab9b64dc755bc17fd354d13eb8 SHA-1: 391ffe9f49a2a91146de1aea5ecc434aed89eb98 SHA-256: 3862012ed21366faf1770114b2d9aab1513a1ed817844f5329dcaf53ef56d4f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 malicious score 0.9825

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 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
  • 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://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/tobuziwunetekowuwefoxeg.pdf In PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8c8909d9f49ee63bc9aa711dc0ba5c65/38575797739.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee26f37db---dajulu.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/82f4c7079a3256de196f463e06c2bf10/82245650646.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/92155531921.pdfIn PDF document text
    • http://usateatop.com/_upload/files/wegaxujipubaxedif.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd8e6da439---xipudaw.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070023d23baf---xinaxinemuxo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0a2750c22---besagozom.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7667819b0---xavikufivasedevalo.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00fd16cb85---92132022850.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/bdb5394e28c9ad007cfb25258eed8272/11188692834.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/6de607a0c3ff545a5538081dedf74bf5/49196843467.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8cc4d31dff468595ff834c17e7638689/26562396939.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be51b66d51---45588632332.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/88579254076.pdfIn PDF document text
    • http://clarasonic.com/upload/file/54994783527.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4cc8abcaa---razovuxodig.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/4589e1491b3f321a55d33be08310fd28/63338648237.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/84183546409.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24f9498408---gibanenozovodozuwe.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/123254178260a063fd1fc45.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/72841500544.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608446cdae83c---88127656409.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/29497955555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=unblock+telegram+channel+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000157bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x157BC 16984 bytes
SHA-256: f2c051364a767a763d2091877eb88400c3ed9633e64c873b65782bcd938f0969
font_00_sfnt_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 19184 bytes
SHA-256: 720b1218b7fe8f8234863f2db1664e3cbaba18b4bb7a8e82cb0a3f73de18f03b
font_01_sfnt_off00011bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 2684 bytes
SHA-256: 83ccc66b64451d5f840ae350369d43a0a13182671c17446cd669f3cee1af3318
font_02_sfnt_off000126e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E9 10888 bytes
SHA-256: 1924d9230011f0f536b2047686213a5b2583b6b9a7aa915a65be1d1ef10deabf
font_03_sfnt_off00013fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1