Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f4b6422432a7fd…

MALICIOUS

PDF

85.7 KB Created: 2021-06-27 12:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8d42c647ecb4ed416ff4cc2739a6445 SHA-1: 8935c73d0674fcb062f10bda452d60beed972629 SHA-256: 14f4b6422432a7fdc2ba2ce040ae601c5fbe6f0b5b8a6863dbd74ece0d1b06e3
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing or malware distribution sites. The document body is unreadable, but the heuristic findings strongly indicate a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://haps.company/wp-content/plugins/super-forms/uploads/php/files/g8gbcr2mbuth2a4scuh4afkhf6/15856159144.pdf
    • https://monamifrance.com/FileData/ckfinder/files/20210619_DAE9C68C683A3A4A.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae1396e676---54568174185.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608286deb0572---46891405113.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5ded0c1c754f8e3f0acc39ddcf9ba75/80949508620.pdf
    • http://aliceinformaticasrl.com/user/pages/razoluvagidofosegigi.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607187ce45869---dukabig.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/b4f332e6e3e07278a046508953f34e2e/47842671870.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2e314d60680d237bb19e65120ac3b12e/zujajepeku.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8e196b32a---6726345551.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d7bebc7bb---zotopivunog.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a16b44ab7351816fdc053d87f97bb50c/47211563602.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/3nnujd1q8hk1q017s4lll4bh8c/15853467772.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071b4f618d52---47696716920.pdf
    • https://olterus.com/contents//files/jukin.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607906be6f3d8---vuvogaramavabo.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/84703324983.pdf
    • http://kochamsushi.pl/UserFiles/file/51426769637.pdf
    • https://maximatrimony.com/ckfinder/userfiles/files/pusegoviro.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5a739dc4a---12782093987.pdf
    • http://modellszerviz.hu/userfiles/file/pujololokazej.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609facaf094a3---xefugegidutiwaxusapola.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba38bfbcbf0---zewivewesikamuzeg.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=a+stanza+with+5+lines
    • 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_off0000ea35.bin
de48984c5c64d650f10443b2874f8b87df5d467cead16c3c4075f1ff7de8b9dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 10248 bytes
font_01_sfnt_off00010149.bin
0b2b37cf50646355ec7fdf02bd6fb84f16208ee37a948ec59cc5cba17bc04b1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 18160 bytes
font_02_sfnt_off0001300c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1300C 16792 bytes

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