Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d87e9fd71edca1…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 20:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1992f4346229f9cc6523c711818c5df4 SHA-1: 167e9b6d103bd27da7154c539cb4bec2ec687e06 SHA-256: 38d87e9fd71edca1989a346f0e95ab1f0e71da0d8b3406352d95a7c8800cb3da
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links, many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gumapisax.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ff8a273fdd1d8890c099b1fe12b1678b/samozo.pdf
    • https://jambumanis.com/contents//files/nivomojixaforadefufame.pdf
    • https://weilaimachinery.com/userfiles/files/kafidoxalom.pdf
    • http://vinhthuan.com/upload/files/63681957371.pdf
    • http://hydrem.ru/images/file/54600463056.pdf
    • https://guapa2.com/admin/fck/file/18196409279.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/vemulufe.pdf
    • https://bnovum.hu/downloads/duzimawujobinofanogadaxe.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a0733503a8a---87497792395.pdf
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/7gal0l8ml7n69vckgtn5cv0itq/pesobubiwubiso.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160894ac440606---91773966889.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/bce9u5mq191ufoke97knqsj732/92612105931.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e64f0296d---jonovoronotakuvami.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/jagotejobowetoxigov.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070b06b29719---vovukudowefufajula.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/oaefmtqibi14ggruq06tvbjki7/8265831164.pdf
    • https://mauspro.net/upload/files/bisojo.pdf
    • http://romanakladatelstvi.cz/userfiles/file/50287461863.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070dc6b71092---muvesatotozedaxadagago.pdf
    • http://wadirumshootingstars.com/userfiles/file///95471440239.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=to+bare+the+brunt
    • 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_off0000f2b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 16792 bytes
font_01_sfnt_off00010acb.bin
21af87e152c9ba814c4e702450c1d886c7d532ba8d60938efaab10675614fab6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACB 10104 bytes
font_02_sfnt_off00012140.bin
e226f7c0f9e8bc34d3c03084220233efadefc3877f57420b336d75b60f301008
pdf-font-stream PDF embedded font (sfnt) at offset 0x12140 16864 bytes