Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39b9708672b2280…

MALICIOUS

PDF

95.2 KB Created: 2021-07-05 19:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a6e6e176d56ea5036f6eac0e4bf99dc SHA-1: 71d03f004905074cafeaf274132d643066ccc8b5 SHA-256: d39b9708672b228099ebc60e6928be125d69b63b8810b11abd8a79cf2eaa4a2b
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of a 'download button' heuristic suggests a lure to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090933d761b9---65673161145.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bd47e0977---78464815479.pdf
    • https://abeess.com/userfiles/file/vufasa.pdf
    • http://bigredclassof1960.com/clients/879476/File/tosurukazifekatudexefaz.pdf
    • http://intertexmedical.com/userfiles/files/saboxukiwe.pdf
    • https://menu2uplus.com/images/file/62634507578.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/1agqnfspg4ei68elvet0uk6o1u/mimarexepiduvid.pdf
    • http://originalcheck.it/public/img_admin/file///6499695584.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b9947a048f7---97495721679.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/2e28edd4680136edf08cc2d4cbe2739d/mofawiraxefomopadogitida.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d336308d5948d32cdf8d6b5adcbcc9ec/verifi.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09a3721e1b---10936875887.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4ee587d7b97ddd7b0e8ee507949133fd/fijomagatodigoxi.pdf
    • http://studiolegaletrotta.eu/userfiles/files/7114392332.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9a453474b643df2b32c6d21d6cbb71a5/89989277205.pdf
    • http://imbirimbir.ru/files/siwedijesak.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97dad762c0---varatogu.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6bc51f2d4---9924430818.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/61grcrdffp9mr981jo7mvjbrb3/dudifanosejonirapon.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/828135030f29239c98407602d3b06c7d/66438028725.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6136072b---gesatigefukiremi.pdf
    • http://tatugigo.com/ckfinder/userfiles/files/2486772234.pdf
    • http://casavacanzesanvito.eu/userfiles/files/9548181281.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=if+somebody+break+your+heart+song
    • 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_off00011074.bin
2fa9de69a2f9bf9af9623a8f4ca7a6ca160bbf77dc1ea02b90294acb150d44c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11074 11060 bytes
font_01_sfnt_off000129dd.bin
d82063f16db51f85530a1f6fce0e490468b3191fd87e5c7d829b6e265b84df03
pdf-font-stream PDF embedded font (sfnt) at offset 0x129DD 16856 bytes
font_02_sfnt_off000155ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x155EE 16792 bytes