Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf3061d6d2d9b2d…

MALICIOUS

PDF

88.2 KB Created: 2021-09-08 01:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 810304e89d60fca16bb3a59131a3aade SHA-1: e00aaef1dd6e4f4235dd35a3db1a6070f64c2871 SHA-256: 2bf3061d6d2d9b2d3ed18b54cd0ae68d0e3fda27cd804867f8248fb1d73d445d
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest a coordinated effort for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3a7484ac35b5c3f85de92f1a1a7ac00f/30560319372.pdf In PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95dff1bb41---darubaluvepugevaduwage.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/modijedagewexufumir.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dd19f16acb---76185603344.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2fcc7a77b---rexojoneribepuxitozugukav.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083089767c21---69721970133.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a9d7f87b5a7feeace7d1fbf96e70eaee/jikevoj.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c08cb3af---84661437656.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/wanulupejuwopax.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079612a70d11---83338210412.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/47013564837.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/zimisime.pdfIn PDF document text
    • https://medpressa.ru/files/file/84896020652.pdfIn PDF document text
    • http://unityproductions.com/upload/files/86792309075.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/zoruritegexakereri.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/zonem.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3fbcb47ca8da70c69c57358e19896e2d/79816384300.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/32911644790.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161189ed5342e0---45448416200.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/xonojoxenenirinujom.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b7c27bf2f462ea24ad360391ca870b12/6920819379.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/mubelodiseb.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/63172415614.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/wipufafajalamigukuruvuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=junkers+gas+calorimeter+lab+manualPDF 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_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADC 18064 bytes
SHA-256: 5b6e81c4b3ef5ffea2114c0b7ac00f0e4a91fbd9ca82c5cd393ee73a44014cb9
font_02_sfnt_off000139e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E9 10896 bytes
SHA-256: ccd6aa272cf78f34ea0d1616cdb25c730c3475e2f35f48356988e035d2b588ec

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