Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dba72c98eeb10d1…

MALICIOUS

PDF

87.4 KB Created: 2021-09-04 17:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb3f4701d3c949db78ef505a29ff63d5 SHA-1: 4e132de305a32f73f21169ff97d6afe66c3f5539 SHA-256: 5dba72c98eeb10d13ca52f434acb0afd00a34fde35a32e276e4bf0c892b5079e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was detected as malicious by ClamAV, specifically as 'Pdf.Phishing.Trojan'. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to external sites. Several of these URLs are hosted on compromised WordPress installations or disposable domains, indicating a likely attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3031

Heuristics 5

  • 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
  • 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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/3291d46ddab34cf3e22fe07a386c8500/92610613968.pdf In PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eddd87b6d2f6063e736cb1d8c496cc8c/96891792140.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d911b1ef4e9---9613079922.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b55ca24018a---rilukuzan.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/7015078926.pdfIn PDF document text
    • https://gilbertems.com/videos/file/93789915466.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/10328057484.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ed0d959a14---gabatepufobinebexasise.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-20/20210520235239911485.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/foguvaratoxopofexajutala.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/60066481981.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c5d81c7997287be7b869133396ecdbe9/14598341501.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/wexamog.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/zidisaber.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6095b3b53---guxugegixuzo.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/2d336f8e0b16524d55b58a1b79d57ee6/sodatupifutavarozeginudev.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l4ucaq50ueguhktu3mg6e80ns7/pitagovuvupejuseritirosu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d9e7bb17a92b471ba7695c839086bb23/sudupenopugekusoxelun.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9117a78e9---21516481674.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/40341513814.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/pikejeduxevupafom.pdfIn PDF document text
    • http://guitarenko.fr/img/files/fejiv.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/putimimuzejaweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=viessmann+vitodens+200+boiler+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 10924 bytes
SHA-256: 1123a234e6716a7f058dd59e119c0992e9d3ac5cc873a7c6fcb3684c80dae416
font_01_sfnt_off00013a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1