Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d8f01ce11cbb43…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 18:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21bdbc93e3facd54306d5eaef4e032fc SHA-1: c41aa6ebdb400c30eafb4ce53b2e323f59dd282a SHA-256: e2d8f01ce11cbb43b7f5d31c7fc8f30ba68463dc7757395b8c9d409a2cc34838
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The ML classifier also strongly indicated maliciousness.

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://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9ad1151ba6e1b5ef596cbc672d9c0617/88672411071.pdf In PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608188fa9fd5f---lusojob.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/bubiw.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/jawalepaletijukasibopuro.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/14404447147.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/59641307465.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/u0lgglbde8s2g5l17khfasvqb7/5156739397.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610dbba200b6d---56095342171.pdfIn PDF document text
    • http://com123.vn/uploads/file/nilexomi.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/47b59464f4c1761412eb0fa6a8f914be/kavokepuwunu.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/fujiwusaxogawipex.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/zimukumosajevo.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/11053823116.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160798470aee9b---16359483641.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/98258504167.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc426b5fa---13765801474.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/85a95a511913ab7a8b14c07928c262aa/musaguvofoxiditegax.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f21ac0363ce---26749435405.pdfIn PDF document text
    • http://aps-mes.com/files/file/rukutigisomixikuluwewino.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160886b3367404---xurefalef.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/jiwuwufuxowi.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/wadibidumasopas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=adrenal+gland+anatomy+and+physiology+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_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 17832 bytes
SHA-256: 9a37a431643514d471c37e80f9c9faa1eaa5eacf73ab0448c006ce8f709ae88e
font_01_sfnt_off00011164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 11040 bytes
SHA-256: 0e3a7ed0f1337b8dd0f13f0a24ced54f6a7546dda7c7ad650dbd6c59237d3c89
font_02_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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