Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab922e657137112…

MALICIOUS

PDF

129.1 KB Created: 2021-08-02 11:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4ac7ee886985494af7c86cbe286ec500 SHA-1: f9a42b16a39fcb2924ca9b8e154e341e816d2f55 SHA-256: cab922e657137112af4471d78dd096ae7c40f43b80db37bf3893fe104d1bce03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9876

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 http://shengnabei.com/uploadfile/file///2021060317505540.pdf In PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f5065c9f76aa1f4325f415a1ab1379a9/dekagabuwodevuwevimafewil.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5450af81672a925c582ddaca598e88b/sumudunor.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/38620108812.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bcc66a629---tiposuvefezaxelulidi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/21555912447.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/18412511747.pdfIn PDF document text
    • http://candientuvibra.com/images/file/38252965404.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/24/file/20210524_144252_171.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f664edb0d---nimureriguvoliga.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/722p1j9392vuvimeimec2ukgv4/30405442845.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/274524573f3c6b78175bd0ad0e50187f/3294448763.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d9fb91c37---81171308456.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/1aa1b419eac49544a91b98b6f291741d/fadaxidegafuxofipetojax.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/64012966882.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a4fbb5dd---82978612954.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/b263ce0ec353860511a831d003e322e6/61186428814.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/18101402681.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c974b6bfde---31192806677.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210604_145300.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/87438162051.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/lutitodizovo.pdfIn PDF document text
    • http://dzbnf.com/upload/file///41231004500.pdfIn PDF document text
    • https://digireg.dk/upload/85769325899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+harvest+moon+friends+of+mineral+town+bahasa+indonesia+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://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
stream_006_off0001d064.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1D064 17804 bytes
SHA-256: d177d82c429acfc082d255bc7bbe928df7f5c3c89c53ec31b4bb2fec4617c087
font_00_sfnt_off00016724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16724 10912 bytes
SHA-256: ee87038ee493ce9cb6d7ddb916bfa09ac52b35297a5b69b0483b8948de8b331b
font_01_sfnt_off00018040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19852 23312 bytes
SHA-256: 495fa8c6f52a66669004d4141ae521ea7874af7ab51dbefaa6d085214536fca5
font_04_sfnt_off0001ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC24 2296 bytes
SHA-256: 7df7fa2e82cc03cc78273e3ae6ee1528e6bad376c331a052362e43ffef5c6963

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