Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba29f774ae8df5f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 18:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: b6cae625709ce5bf1a4c7ac6eea2bebc SHA-1: 2317e7df025d90aff2b1095b49865479975614b0 SHA-256: 2ba29f774ae8df5f41da29df25767128142cbff0fdd3709ec8a4e8dc03f6a368
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple compromised upload directories implies an attempt to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3qna8np285tdd9cqq83qlnknc9/18261118408.pdf In PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611fb18a3b1ed---2943009728.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086e48ddd905---dibagado.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/bazoxojiba.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/1331740664.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/i4169p9l434o79dbeual10dipp/33288942092.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/sekijumototu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/4cofte72hjbb068m1e4jgosc7d/sonuleguxizizamedarosukel.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-5/20210705153329311619.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/zutaxafe.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/pogukorusinov.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e05524d778---butenoli.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/lawunadanike.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/97291427370.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/71190576931.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/subivilaromiwenizezawiso.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3ff779a8---nidawalaba.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/86929974843.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/ropizupafal.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1a9afaf9ab9f59ecf0039c3e02eb0258/40768213720.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25e3415d2---48490374895.pdfIn PDF document text
    • http://planetamama.ru/files/file/34997016408.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161166b05f14ce---73846429057.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dc74f826586---ledipitejixujidedakoweduv.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/6096705900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=employee+welfare+policy+pdfPDF 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_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 16064 bytes
SHA-256: e140fb83a6ee8979360a92cf779b9ad483145ed5a140e3b18e0a0364eabbb345
font_01_sfnt_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 10596 bytes
SHA-256: 546c7f12472c280fc13357be5fbdca457b70b48a14438976c17f42856e6507e6
font_02_sfnt_off00012472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1