Malicious PDF — malware analysis report

Static analysis result for SHA-256 27dbd10f7ed59bb2…

MALICIOUS

PDF

84.3 KB Created: 2021-08-29 20:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f3f4a0ecf6876e0f5b493c2f9809bc8 SHA-1: f7074c1a4725a849878df91a3a1d5fc7c5d10af9 SHA-256: 27dbd10f7ed59bb2f629ea64b480d124b8d1ce0be010f6ccbb373a1adf39ba2d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://cructi.ru/uplcv?utm_term=spanish+for+ghost PDF link annotation
    • https://skyzoan.com/cake/beta/userfiles/file/nobeper.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160716915c71ae---22382688531.pdfIn PDF document text
    • http://xtra360.net/campannas/file/jonapijubasabomiwu.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160783bd5c41f0---90362914406.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17080177c---20247502093.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/79298433563.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/vixipebabe.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16124749216cb9---97028920769.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/36047199714.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/65160987813.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/10153cb4795120cbbaa590c21d444cc2/nebudafoleji.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/34982725568.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/zowezem.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/7770093404.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210829_2355ACD86F6825C6.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a61fe61456d---95066315316.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/98728081388.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607205fa8839c---fobefixedejutukipi.pdfIn PDF document text
    • http://sireny.net/share/files/81253503432.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/suzulekiwiwawonozadazel.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/urn4l0qlfumarus5t918hhi62v/34623494229.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/59379988491.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160776cb746a6c---vipupadutifiw.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/8t1996n2mfmb0kj3hft3td28sj/zavibagagedujozajabera.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/42160306118.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/qg8t8qi374i6g5nq61de34oelk/54813022660.pdfIn PDF document text
    • 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_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 10536 bytes
SHA-256: 43ad58753ed22b05b19682a09da8e87da11b2c932efc7d84f1092cc8f503fe4c
font_01_sfnt_off0000f820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 19604 bytes
SHA-256: f708cea5136e4789f3fad529a342594463a73462f3534acae3c29cde5a9ed6f4
font_02_sfnt_off00012b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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