Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1de0dda6687570…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 05:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90229aa8bed8add8dd058a45755947c6 SHA-1: 45ee8660659df7f15e3ad9f084d0a3685d42c745 SHA-256: 2f1de0dda66875707e98f24785af60d8b3606fca15ad729ddf70b29f297aefbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of a link farm on disposable hosting and compromised CMS uploads suggests an attempt to obscure the true destination and leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5fde4cbc8---2051585596.pdf In PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/th3hf8cjipshfa5oeeabkviq66/liradezerajofibajolovipiw.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6d3429fb55333a466432bcf3f63fa8b8/nefulegexeburudivasibab.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62f997cdb1---33176856905.pdfIn PDF document text
    • https://actor-conseil.com/files/file/xajasinak.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609735c86c56b---vobuvofejivumuxoxaduragar.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/tomipizaloverozujutefuf.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/61178143355.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/xupoxudazariwow.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb688c703c2---dusepezoradilevoze.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/sakej.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6d4cab203337e5320ce35836c8e38506/44329597589.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mvbqq9g4dj4c654ohfbnvmhog2/17853763289.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/97801244036.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/winatekesonuledosuve.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/bejaduzovotunebokode.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/pegesetipew.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/35867978068.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3254eb6461---74607594388.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/85657238579.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/bixozijifol.pdfIn PDF document text
    • https://morabia.fi/images/file/widatudi.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/sch7g6i5824ose5qufo10emofvh3i9sa/11204714275.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/kiwenemadofebodadixeda.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/76332293088.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/26153093356.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/bigesaxite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=free+printable+math+addition+worksheets+for+preschoolPDF 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_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 11180 bytes
SHA-256: 2ce8c31fbe9f1d3ad92b6bd37b4c6f81be4bf77b60e10065b9a572157e527283
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 16192 bytes
SHA-256: 7a80063ba7451cbb0acaad295ef4fc54c2700fb7d8afc409091288b64ebed5f8
font_02_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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