Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e1eb9cf7fdffbd…

MALICIOUS

PDF

72.5 KB Created: 2021-06-25 07:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20b5665498e3fef6008d07cccf07fc2b SHA-1: e31be5f9c5c1155e71a74f3aad297ad75dd39eb0 SHA-256: a0e1eb9cf7fdffbd8302f941bd7f2f81fab162a990bea92d4037165d8b6f6d51
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites, suggests the document is designed to redirect users to malicious or phishing content. The primary attack vector appears to be a malicious PDF attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09748d3d8---79131752916.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160725ba466285---zepimexowanisutojivi.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d6f9974ec---rilisulokatufimatuxomavax.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/zoretuzoxaxolafetutu.pdf
    • http://easyreturn.store/userfiles/file/pazagalobilub.pdf
    • http://myphamlulanjina.com/upload/files/wogasamo.pdf
    • http://adamslakeband.org/userfiles/file/zupirokokerikufudu.pdf
    • http://hiace-yoshikawa.com/js/upload/files/mevulokizugisuf.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/3upor5ckcjvlmrhe8rn187ac97/wutubamevumadug.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20a22791b5---jovun.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a22e6900f4f---dizoxenuvitubulajo.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/d71c136dd40e8d095e1cd18cf00bc627/15209425497.pdf
    • http://dailitara.lt/bites/uploads/file/87671658031.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad854cd3d---xorajinewaxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=hspt+sample+test+pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df73.bin
df3903892eb2923ae88b737d56ce052748dea4109817c77155449a09bb750086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 5052 bytes
font_01_sfnt_off0000f091.bin
5a4185c7207fe3e4b02d0ee76f9871987e9a7e529c2d7e8fc8ae0b2bac06401a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 10944 bytes

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