Malicious PDF — malware analysis report

Static analysis result for SHA-256 231a218b7d2bd919…

MALICIOUS

PDF

84.6 KB Created: 2021-07-06 10:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b61e22afb62a83b20be4dd3ce05074a9 SHA-1: dbd44165fde685c98a549ace43f2f5cdbd954f63 SHA-256: 231a218b7d2bd9190d1352064d050d548225047b7eb9e8af67eb2d2f345f0cd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=free+body+diagram+meaning', are likely used to distribute further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://inwebjor.ru/uplcv?utm_term=free+body+diagram+meaning
    • http://school19-zav.ru/userfiles/file/81889293614.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609946f50cebc---93441003524.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gua1ihvavqgvhir9u5npjn7f43/mowosuxotufuzel.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3875a3b0dd---fivuvivanenufimij.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/2543dfd7df871ee80bfe09b9e66778d6/81789405386.pdf
    • http://smartvoicecom.com/userfiles/21946971016.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4bc880ecd57c73207e7a668ca334f877/xutejukikijofaxej.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/e20po6hfa2b0l1tfhlsu074jm1/nirafawab.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/xebamumexatibibow.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5df319ca5---najenadanul.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/n96k5e39no8rq8q3vqum31jvk2/mimajorerusugovom.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47763eb4e1---tovufukedabeguvodufokosu.pdf
    • https://canevastoilestjean.com/upload/editor/file/11477961593.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098546c892ac---resutovowozene.pdf
    • http://angarakshaksecurity.com/userfiles/file/vegixobuloguverafogema.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b698a35d2d---kumojokorova.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d029e3c3f08---90842693786.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d479120a3---bemotagas.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/em92k0fav7831ff68jg1n5tjci/62560603381.pdf
    • http://pantipplaza.com/userfiles/file/5671590925.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860632a72c6---nowirunafesomovipijiz.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092b0e684489---54325240374.pdf
    • 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_off0000e5ba.bin
f520f8b91e3bab2ee591723f52806eace1b3f9b70227f14a8fb76d82fa97f086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 17512 bytes
font_01_sfnt_off00011432.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11432 16792 bytes
font_02_sfnt_off00012c49.bin
9c7934b9563f5fcbf3c7543652e7794b0cd48b0b7be17d17a77adc7b14940a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C49 10512 bytes

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