Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b58be875015d92…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 05:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3fa9260bcaf0a569d64b1c727de002b6 SHA-1: 1265d0d5c2f904c2223e8f7353c942012deb1132 SHA-256: 44b58be875015d92136eda0b427b2f51a9de42447106254ec9527d6baf9a8f57
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier output of 0.996415 indicates a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://bawauang.com/contents/files/95792306072.pdf In PDF document text
    • http://aktien-analyse.de/images/File/85703798194.pdfIn PDF document text
    • https://thehouseproduction.net/file/93725244317.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/28191044715.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffde6713c7---betabe.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/82124436883.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133002b3ac25---radofokowubutugukubi.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/godejinesosilugafopav.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/35388591053.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/sabadufufovi.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de51417277---21883469656.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/difafanuliz.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/33667721734.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613255f456995---rimusaxoxek.pdfIn PDF document text
    • https://digicpictures.com/downloads/zinuxumepoxuxizi.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe2cd55c3---31141023557.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/96790175768.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613967975feda---23595708905.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/31445516764.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///86738982953.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/futukafabazagogoj.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1a87ebd36feb02240320a28017dc1fae/vejujovufolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=script+manager+androidPDF 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_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 10716 bytes
SHA-256: 49ddef78ce88ca8335ce64a4e86bcb0603f1cbe0061b247cc78f14f633eb45ae
font_01_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 17640 bytes
SHA-256: 753b681b5512c84f26388f06a69332ca6effc8dc748ca7599850673687ce8291
font_02_sfnt_off00012840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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