Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfa781433c5f7dc…

MALICIOUS

PDF

83.9 KB Created: 2021-08-16 06:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ecafb0adb067a86901d27d047518de2 SHA-1: 43ad7dbbdd5f3677fa04ea8c4348d2004869c052 SHA-256: 7bfa781433c5f7dc87a1cb3b59651cb28c67021801edcf03881ec3d36dd08d34
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the link farm and the ML detection indicate a high likelihood of malicious intent, possibly involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rh-h1tapi-turbo.com/contents//files/nabisazanipasoroderidoru.pdf In PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb42ed7ee9---bunapotabeburitan.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/20288185403.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/44183451851.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fej7vrm8uit1876llilshn4l88/mepimav.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/71427959980.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/13719945793.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/jowununusonopopikutuva.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/eabdb94bc0be695be07c23b8ec725404/xevatorifetifatudolusi.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/78266451639.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a62c7b183a13ccdacfad5d2b633e288d/95109104127.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/papetedinudivaku.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161165e0bbbb5a---gujowo.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/6889384722.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/ddf1f8ebace3245c791c84c4f9342ccb/pubarepudovexize.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e5a1cd5d3---99336284557.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/2723866430.pdfIn PDF document text
    • https://strechybenesov.cz/content/31458429506.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/pusob.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ac691cd3b---nukixerebubokixogesop.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/80505144026.pdfIn PDF document text
    • http://trhs1966.com/clients/b/bb/bbabdd843433c1cf4d3e80624837507c/File/46919755724.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/zegedesifulopetisaluru.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/131ea6e9bc17fa2b46644f10d8ae7b2a/jikudowikukudamobiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+tell+if+a+substance+is+ionic+or+covalentPDF 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_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 10712 bytes
SHA-256: afdec1611162c94f62f8db476864616b74f628693f2880eefd55fe7617971f21
font_01_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 17128 bytes
SHA-256: e8feb0290568caf60c4f86612ff92bd35a7df9a8d5bd4d4eb36f442165e8d028
font_02_sfnt_off00012830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1