Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97c9b8d1abaff45…

MALICIOUS

PDF

67.9 KB Created: 2021-09-15 11:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0fcc75bcb78d1ec04ba72eb812264c0c SHA-1: 14bf6a82f0849e5c67a46e58e19a76515009e6f2 SHA-256: e97c9b8d1abaff45e67db38230c65fbd72d7486d883bb223391e4f19ca53d4bd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. Heuristics indicate it's a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/n66drpbeijg0muag5k1upgs816/69084732276.pdf In PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16139369d6a3bb---26910789542.pdfIn PDF document text
    • http://melvin.cz/data/muxaduzo.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/rifakotesukufukalaxomige.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/76781336321.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/30932450356.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210908181354.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/jarusomefibozoxal.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/loxumavulixozapem.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/82831950875.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/32677145032.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/gukofepazenofotag.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/25615962113.pdfIn PDF document text
    • http://xsteelstock.com/d/files/mezuvokejijudozazefe.pdfIn PDF document text
    • http://djapm.com/userfiles/file/14373852544.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf371f8c5---fixuwalosid.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/72qi2co4b1v3q3pqgevgibc74h/jerufekesulemesalan.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/74104952212.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/vevanekokozejen.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/jikuza.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/jasuwusamobusulidazabuvov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=app+to+download+on+firestickPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC504 14584 bytes
SHA-256: f8ed5ab58d4cf243d043b59bb1ca138607c2cb9cbf5f4e17b810887f10459dad
font_02_sfnt_off0000e978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 10772 bytes
SHA-256: 5f011c9ebfe803d3c5b8cff62ec525955bef3ca3a8a35755b088271351095acb

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