Malicious PDF — malware analysis report

Static analysis result for SHA-256 50518cd3e61527ed…

MALICIOUS

PDF

94.6 KB Created: 2021-07-26 10:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9a33f72dfd20dcabdf016b31df25f96d SHA-1: f9b7573a0d3d7a3b8b597c73f42dc56788e1fbe1 SHA-256: 50518cd3e61527eddf2949e7c5f0ee6c2c924b21ab1559a53205d615b8b7e690
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it's designed to redirect users to potentially harmful content or further stages of an attack. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083bb488f905---bamanuzoredukukobor.pdf In PDF document text
    • http://bularz-auto.pl/images/userfiles/file/37807360061.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/41397721384.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/35dd2f0212c967df9cf8f9ec5efc98cd/50399405638.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/folurofudexufuju.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/91697706815.pdfIn PDF document text
    • http://paliukenas.lt/i/File/lajoluferapejazamirex.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/megosixojavaxadekari.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/6736485455ee1853d18f1e6f599e2489/59978300504.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da698255f5---savasiduvopadu.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/lukinumorex.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091ec012696e---wuzelasifa.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/85af3134a1428e1b618ba8aa2450cf39/redemuzobubefilegemet.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799b1d86970---kugajigovototufevaro.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa72a9d204---jemak.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082e62e844e9---54705053001.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607123c3b4ef6---63765597857.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d674121a88f---68347005958.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/fuwuxewevaludoragan.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/2ko0of0ml03gjtjbdn6rkqf8l2/50747037695.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/silirum.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d60c7bf7ec---bibemedirizave.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10f339ba46---buwunu.pdfIn PDF document text
    • https://lasanisports.com/files/pesopefanasewusemoliba.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8f8dabbf4---67843138921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+3d+audio+bollywood+songs+collectionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 17944 bytes
SHA-256: a505f9befd96dda2c5f68624863cc7c67bd9b72a3311a33d60fa9e363d3cb1c4
font_01_sfnt_off0001239f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239F 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_02_sfnt_off00013911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13911 11108 bytes
SHA-256: 25d22297d252f4db90f2637806693c189a738a33be9239adfd48edad70f367e9
font_03_sfnt_off0001530f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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