Malicious PDF — malware analysis report

Static analysis result for SHA-256 323da9d0c547cd1b…

MALICIOUS

PDF

90.8 KB Created: 2021-07-06 00:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4777a348581a5199407c782f14e30555 SHA-1: d75fc95db1e4586b3288af332d38c20de774b7c9 SHA-256: 323da9d0c547cd1badfaec808775ef43b1fd0796a4420e22a3f843abdcd0b96e
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

This PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. The document's content, though obfuscated, strongly suggests it is designed to lure the user into disabling security software and executing commands via the clipboard, a common tactic for downloading and executing further malicious payloads. The presence of numerous external URLs, many pointing to compromised WordPress sites, further supports the phishing and potential malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://infrive.ru/uplcv?utm_term=require+permission+from+desktop+to+delete+folder PDF link annotation
    • http://fashioneducation.ru/userfiles/file/42242474883.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/30055800475.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/dedupana.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/1e5pakpcqkol4772leleqq6481/powewosofotodavibupivu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f2c6c6f75---vusodidubikamugatu.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/12303059318.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/88125180762.pdfIn PDF document text
    • http://adveotec.com/img/file/bixemimuworalobadubasoge.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/e5acd190b0a7702094c2f136185c243f/85493357174.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/55857429886.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/38998a54ecb6d001c11e74a008d75487/wenek.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8854q2th61p6g31dol31eq24g8/zabavik.pdfIn PDF document text
    • http://anupbolivia.com/images/files/rewejorusamazelojuxov.pdfIn PDF document text
    • https://0900107678.com/upload/file/wogazukirutoj.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc69e3f94---gopewaselefejapijopeju.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/xovirutezuxuzotipelasujar.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/47e90f2a00637f5c5cb62d495c2606e0/donexedawutagazonufawe.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6d880bbac---rebakew.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/71681743674.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/t0hfqp2jat2s7lr32f7gef28iu/jeturajosovote.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb14417481---26936411298.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/80569ae7681f6ce2d7429fb75bc97858/87282654291.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828aa29254d---zomufo.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/62706024973.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_off0000fe6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11685 10880 bytes
SHA-256: 3f7f75981e9c00ca67a7d1c7709b42fdaac0c130d2f0026827c044e5ae1be7f5
font_02_sfnt_off00012f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F65 17020 bytes
SHA-256: 981881f0e817159cb89d10ec0d15d0a399f1f70ea45de2076e66aa3d93db9a4a

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