Malicious PDF — malware analysis report

Static analysis result for SHA-256 36061e255d2caa6b…

MALICIOUS

PDF

84.3 KB Created: 2021-07-16 00:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 828d5921174cb70ec021e51b0f677175 SHA-1: 8eee7bc9db02b78c46df267f193c9500aec211d1 SHA-256: 36061e255d2caa6bc35e8ae293eccd147dcdf13892a81d43751e39f8dfc4c244
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e05b8713ba7---mexawino.pdf In PDF document text
    • http://sosnovgeo.ru/userfiles/file/tonawugera.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8b1f04684---pixupekerukanuzaves.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/2215692671.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9269979e65---96187970673.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/45461157009.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8df06832ea---juwoberorunizifozovo.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/8312267154.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/85772544324.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/rasusefivofezoz.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/33216563967.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7df592befb---72453287855.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620608232.pdfIn PDF document text
    • http://salkim.com/userfiles/file/91208479412.pdfIn PDF document text
    • https://iaetindia.com/ckfinder/userfiles/files/gekonamamesonagukenu.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e1691bfb4881f296e779a25e40a0107b/medatevavaragugoj.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/velelubibaraf.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/61352945816.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/abup9vena8jj5v4vo4d26j12dq/zilemabereb.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7368iahbjsrdrp2e7f9d3ltotm/46450373114.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8f1dd4774---93209849574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=causes+of+neuropathy+in+feet+besides+diabetesPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/bec7b49619d487a93b96fe4f128b12e8/vakubolibinamovegumujoxib.pdfIn PDF document text
    • 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_off0000e5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 17072 bytes
SHA-256: ff3253b9fbba1952e7499a2d670d31722f3485ebdd5d4b1f0b95d4c16f689a4e
font_01_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 10936 bytes
SHA-256: 3dea98a31bed9335ad1987112391c52177ac4debd5be8c02f0b21d771bc52ec4
font_02_sfnt_off00012b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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