Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afa95cb1c6bb298…

MALICIOUS

PDF

92.4 KB Created: 2021-06-26 02:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ae1f9c042a7aecbd3e103e32629c1c7 SHA-1: 5463181cd90c68aab24c5b94afb9a53775b7774a SHA-256: 0afa95cb1c6bb29882541c004ffa50dec04051926ce364710d06c34918f909db
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ctners.com/ckfinder/userfiles/files/18185022685.pdf In PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0cbc97276---todalibirajek.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b87c4c2d5---18551777099.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/21000058157.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bef32049abf---3584490177.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9695bcad8---lolibi.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/vajowebavuturu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafeef9f7e7---dususerasozok.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/najetedod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffba430f55---xunujebalupibe.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/hhqvfstgv23rrof3digfg4ku00/99099850923.pdfIn PDF document text
    • https://luminex.pl/upload/file/66449174625.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/lozubusuwuj.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/32121901201.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/84095420778.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/41512266430.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078690d02452---31931018435.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a483d5c1dd3---95497070467.pdfIn PDF document text
    • http://insureatkk.com/ckfinder/userfiles/files/85935371582.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/suvixazanurasipus.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609264c11e7b0---88787772601.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d200b9ce39---bokakenusinafev.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280147218395.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/95f3e43a427bd860bfe548e478a2f209/21945019465.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085a6407845b---73262974889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=warm+up+exercises+for+leg+dayPDF 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_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 11068 bytes
SHA-256: 519204b734e99f560c75c24b6df7080676d8ca9670abdf7c3d90add77c6e7ce0
font_01_sfnt_off00011e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 17512 bytes
SHA-256: 3e84147baeeb92868652be4421808326806aa9d4a5d1dbbeb519a81961a3accb
font_02_sfnt_off00014c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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