Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a78c6b4db1e7ee…

MALICIOUS

PDF

73.7 KB Created: 2021-07-01 13:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6fa8a1c7de8d7f09d031ec45e1cd56cf SHA-1: 2f9b2aae2b83a0b0bf6c344c28bcb243df28fff0 SHA-256: a0a78c6b4db1e7ee9fac9422c296e9c368242dc2cd50553b645925e5a2dfa5e9
126 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting. The ClamAV heuristic identifies it as a phishing trojan, and the presence of multiple external URIs suggests a link farm designed to redirect users to malicious content. The document's structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3363

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://synerhu.ru/uplcv?utm_term=spear+of+justice+undyne PDF link annotation
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608138d02b796---zuginipenewuzu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081388395700---bagobozisa.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f243e18155---sobabusega.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/juzenuwipej.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609699264a7df---lowebuzafela.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/63205135251.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607049447ced0---74862281920.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969d929caed---vamamenelizodep.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/79881340482.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/16901737551.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c13955e371---xezuzotim.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/5e71a278b66fa0130a1caa54d6b21dab/76330378970.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/fatoxuzozofum.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778673dd199---wosesugajomewobofujud.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/gumevimi.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/9497c41c2355a82f94687df78e9a4c63/87497526747.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fd5ebbb32---vokisisoguselarem.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf91c1fbcf---82564269062.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/53727385911.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/vifape.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d6e6a4eb23b65107dffe8d905e64b9e1/86317933050.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85abdee86---nebisip.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607593d0a2403---47220113681.pdfIn 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_off0000c2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D5 17492 bytes
SHA-256: df11b5a1ce125d624cc24165484f589480d7ed082782c33b82c23d101fc4f39a
font_01_sfnt_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 10988 bytes
SHA-256: da56a4954b11c5d2d746122fafa22340adffb23cbd86cae4e40bfdbc63969ee3

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