Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdf72aa180240b4…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 10:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33295ae6dd4c883610da173223ee91ee SHA-1: b584b6cd459247c55ce56e05666bf4e02aaf2777 SHA-256: 5fdf72aa180240b4a4774e6be25db47b0337b698835b193596839fd8fdbc5835
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised WordPress installations or disposable hosting. The embedded URLs suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://highendschmiede.de/highendfiles/file/dabuvowi.pdf In PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/87973a940e12d8fdfe7ff5155695ddda/68351877618.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5b1fa8f505c22f26a2e40ab8332f5c9b/pusamufoxinof.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/istlb2iogievvqmgvtj7ohulf5/47595961624.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607275cca81a3.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ash9huf0dbm955c1dlm0l74k82/satavenodoletoja.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210802_9A984E05B5A90347.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078fedbc08b7---67008270090.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/lljpt451arqu88l9mvvdk1e6if/68377237457.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/lixuvadofaxogotigewija.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/90d613363bb0750e20d69fcf47ec5cf8/naguxu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611e641f8dc8a---xesabupitetek.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/zoxubovebu.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/46555565222.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-4/20210804113012749464.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/87851792385.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/11991322967.pdfIn PDF document text
    • http://12shio5.com/contents//files/zetoxuxesonufilivaju.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/zejurozube.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/12730954154.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d93eab8226---44104542194.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/rogova.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/tigakugojipanupiporukaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=buzzed+drinking+game+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_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 17272 bytes
SHA-256: 634e798776662fa03e2270d1d88ad3d10989dad12c2cae4beb3268f55588441d
font_01_sfnt_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A8 10716 bytes
SHA-256: 8dc642d3aa83bace4f477ee20b31ea78214a0e15849fb3d11486a0a2b07815e1

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