Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d85b527e9cc363b…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 08:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 636ba9cdedf59776c8c44d9b9e48f920 SHA-1: faed1773a3e37a8d8ab1fc17040c62797a086ff2 SHA-256: 4d85b527e9cc363b3001e3cf6a4da4e9e169367389b642229b6209a7c4c94600
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=there%27s+only+two+genders PDF link annotation
    • http://dok-vo.ru/userfiles/file/fomupav.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/pakoxebademusinenevup.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb25e543b---30997498288.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/42299362296.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e6acb107---losomodelen.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b284bf6506a---luxufamotoxi.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/sesobepobitiwuvixuwisibek.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/kqlrm9olsa95v21n0fgtftaun0/63846730311.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/zosenuvubibodixujal.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/femuxugopufoditefagezol.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/4324755355.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/20bf65149aa56a6aa946a0efe635adb0/96046032892.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/nitisevofelozisomibadima.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/kibipanamoderapipavag.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e40aa0a53---munudewuwize.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/vokanakajodegukoz.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834c2fb56a4---72121060310.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/dca658k35ua0r2bugvtihda2if/40242499730.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/82944020716.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/0t4fdqunhsa7nc5sapa955v7t7/26719472048.pdfIn PDF document text
    • https://profm.hu/files/file/worilofij.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f4642eec---16273001189.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/sejixekefafu.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210707075720.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_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 10472 bytes
SHA-256: 10412f2ae81a3be5d367d463b9c2eca7fdbb5edd638a16eee81f4d66791d49fc
font_01_sfnt_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E73 17560 bytes
SHA-256: 0c024d3669e1f611eda3a459bfcddc0a8ac8733a6b807862452a6053a02b6cf6

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