Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5eb9bbcaaf6dec9…

MALICIOUS

PDF

103.3 KB Created: 2021-07-22 19:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e541f7312d086e09f33d8b2a30ec5f9b SHA-1: cb6918bd27df1c354f8060d37ca35152e7315b58 SHA-256: a5eb9bbcaaf6dec96bcc872cceed0c700a4a4130424cc3f54b04bbd2e30d7561
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to redirect users, hence T1059.007 is included. The overall pattern suggests a phishing or malware distribution lure, consistent with Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe641e25ee---kidedutajafixuzo.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3ffd7f8cdc57dea2ddfaa48fdf6b709d/bosolilaxuned.pdf
    • http://vasvaripalmuzeum.hu/upload/file/90793603475.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49f05beeb2---zenorakojedizigurebo.pdf
    • https://pecsikult.hu/files/file/62114243121.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609426c6ef7b0---56816185804.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/512dee064466c77f1dda9b771112687b/nuledaxawumilamujuso.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/24a030ebf62478ea5661f8b3d0a760ce/tutalusuwa.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9ac3e8c75---zarukajugekabedujimokirom.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/34362349e1a83ff5f4fca052ee987e56/xuwuxoximizo.pdf
    • https://stradatextiles.com/upload/ckfinder/files/pufewotak.pdf
    • http://dokumsuzgec.com/userfiles/files/metilosegaketi.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/papizuvuponawiwexajigopu.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb313af4ec---jinegiw.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/39cf827e4fad5c8ee0a9a5ddfca01cdc/volivejudakiperep.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e2da4022d7ce6ecd776ef983353d60aa/pizopasuxuwinerufivukinu.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/71172835400.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad01c3531---rofup.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/1m4in2mjv4152vgdlclr7mtnbm/67371389941.pdf
    • http://dharmapremipariwar.org/userfiles/file/14303707796.pdf
    • http://www.ferm-matic.fr/upload/file/bizemububobawakalido.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609dabd80b0e0---saxawevipitoves.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sat+exam+for+which+course
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F83 16792 bytes
font_01_sfnt_off0001479a.bin
8e469ba3819259e4bff32ce8178fb6cd5cec92cf385642a1dfa80b00cbe62a89
pdf-font-stream PDF embedded font (sfnt) at offset 0x1479A 10812 bytes
font_02_sfnt_off000160a0.bin
4557e10cc283dabeaf15827b62b5c875cd5cf2073981dfb61f96062f596626e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x160A0 17456 bytes