Malicious PDF — malware analysis report

Static analysis result for SHA-256 302c6e5091c67e1e…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 13:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d246f5fa9429682a484b25a6831b5a53 SHA-1: 5dd01f477199c3ee046e18206b6b2f1aee5dbd33 SHA-256: 302c6e5091c67e1eee4324e7ac39e547fc77cb0d5f9fbdce99e9457991d624aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of numerous links pointing to compromised WordPress upload directories suggests a tactic to host and distribute further malicious content, likely for phishing or malware delivery. The embedded JavaScript and link farm indicate an attempt to execute malicious code or lure users into a phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a05640a53d---4439874771.pdf In PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c37e58dd0e18729ca75f8a7a2007efea/nebupizimubanuni.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d099bfcff6b---40522546804.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/15047338391.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/werakusawepalotaxotoke.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/menilujefe.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c7e28e6e3---mebewetawozupuninuvupove.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/gedanuzikudigosij.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/jolewavonejigesefej.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qkdr3ll2flm5nd527ofm4ujgm4/jujisa.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f4b152956---papigoki.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/81508568803.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/xikunulizokezul.pdfIn PDF document text
    • http://absoluteanytime.com/media_file/files/files/xewonekokogorob.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b2d568d7f83---tupatufowalejavufer.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/77406229525.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/gebomugez.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/28765112825.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778b0919bd0---dalefavasonevanesufisi.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/34329104475.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/47571136770.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ludez.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/35225114190.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/ketigigofum.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/78057020672.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f010cdb3a9196811dfda34514396d2c3/dazozufotulewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=overleaf+pdf+rendering+errorPDF 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_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 18120 bytes
SHA-256: 5ebfb6f75a7391383797d270f094ffe7ea80350124a913c1e4360f54beedd4b0
font_01_sfnt_off0001248e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248E 10496 bytes
SHA-256: 94c6489438f2439feff265107de92a2ded761614dba9c14d4123f01bcafdbe9c
font_02_sfnt_off00013c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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