Malicious PDF — malware analysis report

Static analysis result for SHA-256 a233cdc07d9ff45c…

MALICIOUS

PDF

218.8 KB Created: 2021-07-16 05:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2dbd72fc313037cd6fc2a405f2a4e40a SHA-1: 5766ba7f6a88e9dbc319dd8c3d65e03795546e76 SHA-256: a233cdc07d9ff45cef6a62e91bca9c0cddb895fd6b98d813e3d26c920203fa28
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains multiple links to compromised WordPress upload storage locations, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms points to an attempt to lead the user to malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/605ecd0242dfa0e5dc6fb04c5391f1dc/79150700915.pdf In PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/aa9qjkntos5oja9nuf94g359gk/perirufazupawixokotojax.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/28071355541.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb34a79b4---79142429481.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/96607247977.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d663635297d06841273b08a512e3f553/suxuwemiron.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/nowidexoro.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/77426571450.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/62638868001.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/muxarokamibarumuko.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/skkg1nss0eoqqmj5ibde7u76s1/2144845032.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/17paph14lfe5q1urmj6bbdbs14/gojefafakepa.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/70ad98f2fa8aad4425197d4d0d0bae43/30680818604.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/44728670327.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b881d926---73024536831.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ab218bda330b7093f3278dd9e1ac07f6/45545166675.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/q68se4rh4hqbapsldg9b9oq2da/27673216918.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/56729088145.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/32622402416.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/nabudinibunokebasofewowo.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/nevuwoduxije.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/1usbjf0383s4hom6nucnkmbve6/xajewozevajinomelujejik.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b47c555b2---10075002019.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/dezewozimavimepopud.pdfIn PDF document text
    • https://limsurdua.com/contents//files/ponejubukibifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cowboys+from+hell+lessonPDF 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_off0002ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00031745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31745 10496 bytes
SHA-256: ac2f56076f9968e50dc67044165f044b0c9542d96f4c1d80deb04c2ba4e8908e
font_02_sfnt_off00032f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32F08 18024 bytes
SHA-256: 764e70dd2312d191e455f6fe78507be67635897d62debb213c4453a701026031