Malicious PDF — malware analysis report

Static analysis result for SHA-256 37aa5b7f7782fc3d…

MALICIOUS

PDF

66.8 KB Created: 2021-05-09 05:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8070e791d5fc5b055849646cf3e2dc21 SHA-1: cef0ff761423b80827130de274367291ff58c9e4 SHA-256: 37aa5b7f7782fc3d331f8a9d79b5210a71dd78bb3a2c368d18e2d36f7e0503a2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the heuristic firings point to the document being used as a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8459

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e050990c8463e3a1d989751a58ae8213/tadufotewekisopenu.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/satr2js6qc7hphobssmfvhoil1/46971842096.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/dob9camp5k9ib8ojhan5knlrau/79284739334.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/118c9d09798aea2a67a5982d27c011ac/37992633113.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e405394d65---13098607643.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160972b6240bf9---menivibisa.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba45613d83---17921664522.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3068733b6---91078490530.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5ac26daa5ab23df9ea9935e8607a1116/pogusogir.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfa3a362fd---xuxapu.pdf
    • http://tlproduct.com/userfiles/file/90440327025.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/16403658cc13026e66de47649a1eed64/35335415503.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/79c1b1a8e0badee390a5f9d345b26966/popawanuvakiwivibam.pdf
    • https://abe-rdc.com/userfiles/file/91667154924.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/583e397097621ca61d8127983bbb2967/23321861093.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160722d2d177bb---webavogevevoki.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070b721973c6---86166452097.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709641be0d7---takokijukozubutadeju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=root+cause+analysis+fishbone+template
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da32.bin
57d75c15b469890cd0cfa2c617d2961dbb811d4dff06e3f54f009de599046082		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 5408 bytes
font_01_sfnt_off0000ec83.bin
ca9121c97a3f12d7b8f8e076bbf1423b64c86db15fcdd69518dda591211f9b1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 10316 bytes

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