Malicious PDF — malware analysis report

Static analysis result for SHA-256 925a3466500ffcfb…

MALICIOUS

PDF

123.7 KB Created: 2021-05-11 12:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2e248f075469da6d850b79d2dee028c1 SHA-1: 9c137020e43c1733c4407592c7b6cb89a7b647d5 SHA-256: 925a3466500ffcfbcb8bfe7b074116acb69978a493541d0e01332e7683d915b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078761e1ff7f---xarogegapeziruxofepu.pdf In PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/epric6jlphfc8fpjeotk33cup2/jikozapunipeluvumojis.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16099b7a9c4c5e---zotipekov.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/45a6c953120b199b8a5025090dfff1fd/dabewerojutunatinize.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/1fhje4cflhdnkfq289o23554ml/newivawesidibisejam.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/90702023024.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750734afa74---vemeboxixupamidupoxan.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1f0a20d54---vanamazagapadimorejotedu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe78b11445---zexudipurolewa.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/xovuxetofosabaded.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078b438bdbe8---66804471985.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2726bc930---4169971775.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/7874bc1aacd3c37aa0b23d3a8edc4774/34816549920.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090596f8128d---jozuwukexes.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082becf65898---juzusogiripudevemisifat.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0b3f28b00fd07faad836c12816db99f3/bibelokilubuvekosifexuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fundamental+theorem+of+calculus+worksheet+kutaPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB3 9800 bytes
SHA-256: e0ad9056224b011ea5130cbeb2c543398847fd97b26edac3a84aca129dbdc7f7
font_01_sfnt_off00017d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D6E 5372 bytes
SHA-256: b09fb4eeb37d4f40bb24e615960d4872ad911e68e017f7b5d8892c158574416d
font_02_sfnt_off00018f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F94 2272 bytes
SHA-256: abeeac7dca764f7527780194800fa4d6dddfe663baf9c6ea0387a7cfe880787e
font_03_sfnt_off000199eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199EB 13128 bytes
SHA-256: 18793124a9d49d44dd2f1818499f6a757273fa403debb125e53ec74ab71a0924
font_04_sfnt_off0001c675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C675 17624 bytes
SHA-256: bf061a1f6c37602476bbd46d12ee2941d12d37359d29f37af073d858e2b584fc

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