Malicious PDF — malware analysis report

Static analysis result for SHA-256 14eb8f17ae3c8fbb…

MALICIOUS

PDF

88.5 KB Created: 2021-09-07 14:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 24bb10b07acbca5589bba0c5896c9233 SHA-1: 2b489b9e616839a576fdbc146c58f3130fc67e72 SHA-256: 14eb8f17ae3c8fbbf3d4ac9ccdcaffbf103b172e0624b16b346f0f4678db0057
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. The document body is unreadable, but the presence of many external links suggests a redirection mechanism to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e947d05f4---60147960803.pdf In PDF document text
    • http://sujitonweb.com/userfiles/files/tadadivixonegavodulow.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/magabaxitaro.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a75972509---nikiwakogozunegojixuwalox.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/df2655ad8bdb11c77de6e00acbcb58d5/wivinaletezederaropa.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/21233565748.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/zuzawavezejawinad.pdfIn PDF document text
    • http://esejsc.com/upload/files/89085727264.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/rufuzemomi.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16087827ade25e---jaxuzajubidokazogit.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/kuxubizesasomimowisipixe.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/275l9ieqe81c4a65omeua5nfd2/60965088163.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/59823235908.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210505161356.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c72b71ac8---jolitubogu.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/31415670584.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/67728284180.pdfIn PDF document text
    • http://machulski.com/public/file/luginabudojefe.pdfIn PDF document text
    • https://piphoto.tw/uploads//files/202108112332023406.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075a53250550---17832714744.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/nowot.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/fitelijixuximamer.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/33d14ff1328062ff1daf605f9497bf5a/46327903379.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b40db710a0e---zunewo.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/7141173022.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/pirapifofujezatikulewutug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fisica+vibraciones+y+ondas+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_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 19952 bytes
SHA-256: d08778a2ee4c27d2b234418b6446b8ededcb2de1fc99184c30b4a126f316102b
font_02_sfnt_off000139aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AA 10764 bytes
SHA-256: 2e834373fe6abf5c24f89bc8c2fe6c93aff1a1fd4b90cacc5496b9d4a035d413