Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b8239748102b5d…

MALICIOUS

PDF

71.5 KB Created: 2021-09-02 17:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bcc379d48e1141cd272d3d409a9fd98e SHA-1: 609914e261505692eb5f532b2c3b71ab2f329d21 SHA-256: d6b8239748102b5d6b6fb7289ca201d8cdf861accfb5ae77ee8223b5cb617185
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to various compromised or disposable hosting domains. These links, such as 'https://crewmak.ru/uplcv?utm_term=nokia+c1-02+manual', are likely intended to deliver phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=nokia+c1-02+manual PDF link annotation
    • https://marupyara.com/fotos/userfiles/file/37551845232.pdfIn PDF document text
    • https://media-get.com/userfiles/files/juxeni.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef42a49a5a---zegelipumunurif.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/rg707jb6i1otpruk7rdp7p0mgt/fuvajuge.pdfIn PDF document text
    • https://nada70.org/userfiles/file/21935553279.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/bovumidepowe.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/37302885373.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/32468369210.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca554c398d---zojeretajugoxaro.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210701234938.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078009577cf7---somule.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/a64bebfedcd38e8900cc41bcd117b1dd/6829129904.pdfIn PDF document text
    • http://brlairport.com/images/file/37658324302.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2601b9991---81232140528.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161168ae97d129---23664855068.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/a5a4b0c58a96882315d4e918700c87b6/4986808301.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/11408349711.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/32347887079.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612929b6d7b76---wijafa.pdfIn PDF document text
    • http://maksimetall.ru/files/dedebixijupubiduvixa.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/1341e90f40d8eb1ca077029e8983b383/30314819983.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2af376bd3d8205b2afccb608b5f44148/kewudejojibumi.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160826641d514d---jelonipedex.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_off0000b6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AA 16516 bytes
SHA-256: c065c31cef13f1c426b5856b4827817484b7f289673d884be585f56e9064b5f1
font_01_sfnt_off0000e144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 10392 bytes
SHA-256: fd8f3b2c04fa6b3a976133d1e6b660b6283644bc32367603db031d94567090a2
font_02_sfnt_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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