Malicious PDF — malware analysis report

Static analysis result for SHA-256 c829b248d95c6166…

MALICIOUS

PDF

98.2 KB Created: 2021-06-29 06:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ee7b8e42ccad115d53e62fe3b0a59590 SHA-1: 83ae176c0cca86abf18c5c28a0f79e1665d67df5 SHA-256: c829b248d95c61669013fc8d7bb5451bc8ce5c5d9e4d712af314cb9be185ef3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e025f71039a3167fb69f0ae01e17642b/87564229395.pdf In PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/guxugiluxebalureso.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7876547f8---48928367718.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/mosojefixoko.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210602_A3CEE4E1B072CBF1.pdfIn PDF document text
    • http://yuha.be/_files/file/lomokavo.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/86b83ff4f00ecdcf4ca6206f5dc69d60/vowadopuvowekine.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d87a4bf19f---17599311641.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608073c38c086---18117516881.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/aqathrcpfcdqsv64cle878ee5p/21090707557.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/d514f16c37accf8e07e5c42f99daf5bd/39417976554.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ffcef4ba8ca4bf14e9c1bac6637e116b/24513703969.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/96716618692.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0da7cbb08---46884569888.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/xizugaboxezupituvivomajun.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608947b07cf56---50697551892.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/fb3b7c283d6eb7aa3977d4414b41a153/vidogi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160beb62d2deac---fisajasojopen.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/sipekiwowolawipaja.pdfIn PDF document text
    • https://airbays.com/userfiles/file/zabog.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/gaxanisuluwosobadoguj.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/mopogodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=slope+practice+worksheets+with+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 17836 bytes
SHA-256: f0930e56b50f7d221dda5999cf1bc6a4a96082153bbcf8876b080c21d09206d6
font_02_sfnt_off00014d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D06 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off0001627d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1627D 10724 bytes
SHA-256: 3f8bc2f05d20e5e4599598e1747ca7644ef59ac78c76d59159abae812117167b

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