Malicious PDF — malware analysis report

Static analysis result for SHA-256 5079ed96c0dc61d3…

MALICIOUS

PDF

83.1 KB Created: 2021-07-18 22:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55f55d2a5fefa520ad448c4676646173 SHA-1: cfd8d98a894e7d61b1a0156e6fcb2f4e09e946cd SHA-256: 5079ed96c0dc61d328612de3795cecf46238f60ff6dfbef082d156ab01e6b822
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns suggest the PDF is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://casier-a-bouteilles.fr/file/silezaduborevosigudij.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9036e0ea00833c6e1e8128b02ce81bcb/jakugewewaru.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/oc5vrvc14sppgqer63qgj3f2u0/63042174447.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/6667ac7017ec04e01fd341864d6bd764/furixovuko.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd823f00e5---puraxaxidupivi.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/47b6a6ebcad8dbbde75cec44536777d4/keluximavareraweli.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ah2dculj63b360vfd7r4il19dj/7334544828.pdf
    • https://abe-rdc.com/userfiles/file/tamidupesirotiguxufuki.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160af46feed39e---detotudurasafutimi.pdf
    • https://maxflowfans.com/userfiles/file/89363463159.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ff036fef3367e44addec6a0515e41e23/91762046470.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ue3c5p8cghvn1chtin1u9lqs1k/zetofazo.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8d502a86fcdf45cae6a496e5527dbd73/79621133596.pdf
    • http://banghetretunhien.com/media/ftp/file/35752980838.pdf
    • http://steakclubhn.com/campannas/file/86498472711.pdf
    • http://yule-sign.com/upload/editor/file/20210610110543.pdf
    • http://thongthien.vn/upload/files/gevulug.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e2e4db83---23080005688.pdf
    • http://asahiru-ban.com/files/files/nuluvexalakitexibe.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c45c6837fde---varononojofutagufopitur.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8f67f26dfaee3c2382e64e4222f1d388/20047967844.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ea2901bd6122fa80d41ae118a24779bb/lakipakukasusejufun.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/71690967406.pdf
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/xolel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=those+in+the+know
    • 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_off0000e0df.bin
0373627c12862e781d90ae89cacd30b97355589c18f8125920cc08623ebfd2a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 18476 bytes
font_01_sfnt_off00011100.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 16792 bytes
font_02_sfnt_off00012917.bin
83c43dba1346ee27ca8f4dd6c5c92c7f354f38c83628cfc9ea1f069e54d9c20b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12917 10040 bytes