Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b3794c0fa1b8f6…

MALICIOUS

PDF

78.3 KB Created: 2021-08-03 15:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a036c91e713da65b67f01933f949d858 SHA-1: 9b19ca103ad252fc67c5978ec6ad8d56b455a758 SHA-256: 12b3794c0fa1b8f6304922f565cdf7b4beb6db8d9cf5e3ebc483bba0ac061a8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious PDFs. The primary function seems to be directing users to these external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=enemies+with+benefits+2016+full+movie PDF link annotation
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7051fe956bf7e3dbed19469f9fe934d0/45125070931.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/b24844c6a760511bd566496f5e279232/lepulusopidokudus.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7ee897a254---nofojipotapi.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/kidirajevafe.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/sarazedenena.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a35b96ba5ec---bidamazinudilagoxunisiwe.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f414044ff4e---98858654421.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eec768d29---jafusunevas.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99a3fc69f7---83442902266.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/jolizuramudazaluzewa.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/bawuxotelin.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5b6b7a98dea9a5e5ee89010837bb012a/lutemoze.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/webolibasava.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/44961785999.pdfIn PDF document text
    • https://bloomeng.com/uploads/4162723627.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/98505091981.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/cd18543d29d82c7d7a77fd5bb261fc01/71336122835.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f91b3936433---80425208634.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897526710f6---57463641473.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/80407339003.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/75418301029.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/mosutu.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d3cb53abf84016599c125a6dc1ffcca6/foxofuf.pdfIn PDF document text
    • 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_off0000cb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB84 11052 bytes
SHA-256: 3ec0d584146f18f6e8f59d0338c5c8a37a321c8566a540dffadc8a2ac5de0d27
font_01_sfnt_off0000e525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE525 17860 bytes
SHA-256: 7a7cd5e86031356293f47741f9bfa0e6ed8f23b5c144a3d48cfa4f12a0a96750
font_02_sfnt_off00011318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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