Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba05139594279b9d…

MALICIOUS

PDF

87.5 KB Created: 2021-07-22 08:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 276cbaa36a00180b8ba31b37225b231f SHA-1: fc62e06ce37973544d25114c1a0b05c80193d66f SHA-256: ba05139594279b9d411e4b1f97d39d8e1fe6e2d8991ceb7a26efbcd9f0e6c823
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple compromised CMS upload links and SEO disposable link farm heuristics strongly suggests a malicious intent to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://metafelix.it/userfiles/files/55995405085.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16075c6cd2bd15---gixipifupezelopafa.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/pjkvkmju6jffi2p21hnsmd3snm/61622313496.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/lumazodavoj.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/41052850189.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/walakosetodebam.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1ac5863cc5d25a655b9c1f7a23ce9f32/gigulijexa.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ja5m0gquet22bkccut6170lcup/fototeguvesigasufeduvasag.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/33938008403.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/672bppq0nimb33k6lp1t4297ul/miketusexudolipezebepevoz.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082345751c99---sawevozotib.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/vunifevilod.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210701143215.pdfIn PDF document text
    • http://17njl.com/userfiles/files/11053683399.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/ragolijiribikul.pdfIn PDF document text
    • http://teplospectr.ru/images/files/xezafokukuvuf.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/vuneluwutonuxenetisu.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/l38hm0gmq7d2o3u5vap1if5osm/dopagulefexivajola.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210527130142.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/gffg5b6mtidj46mmcmh63b4ild/25488834879.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/japagepebiwukoximuda.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7489ecfc7---pifosizalutoje.pdfIn PDF document text
    • http://ocodereducation.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=unreal+past+and+regretsPDF 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_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 16952 bytes
SHA-256: ee06bc0ea08b24bc1b766c230a76a0eacc559eaa41f5f246021ccc155b43ca71
font_02_sfnt_off0001392c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392C 10360 bytes
SHA-256: 903a754e9d09f82471c9ba322eebd52e58a16cea62e9f99cae6fe3d3416520d2

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