Malicious PDF — malware analysis report

Static analysis result for SHA-256 d815b74362f33055…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 23:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92c8f5aa91185c7229415ca90eac0ea7 SHA-1: 2edc444f8e7370fd9e9a72a5f89f50ba986c3a83 SHA-256: d815b74362f3305563af0c413fef4d1fa38eb891bd6d86aab2ed7f07f0697967
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, contributing to the overall phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=roman+numerals+1-1000+pdf+free+download PDF link annotation
    • http://lauraestetica.com/userfiles/files/79728148040.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311dca9da9a---66658024001.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/41770822997.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084614698748---15885281213.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5c8aa5e2caae3206500ac63203002358/69745134462.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/37805503018.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/31528466521.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607452eae2014---51753461505.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/fj6bbkmjdkpqgatif6g63h65jl/delemasonawi.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/64220719087.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/89001059146.pdfIn PDF document text
    • http://greenld.com/userfiles/59730052513.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/46997756081.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/62341937976.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/25070703181.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/fijimasanusefiwax.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5605e3a2b---71577385514.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e819cca859f---vimimavelexogokabudumoz.pdfIn PDF document text
    • https://laser123.com/geektic/files/93161181531.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060421310349.pdfIn PDF document text
    • https://cubic.is/userfiles/file/83060506077.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_off0000d708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 19636 bytes
SHA-256: 5ee6de0080ac5fe8010daea7be316fad930ea4dd64bf5a73577dd200aeee6ae9
font_01_sfnt_off00010a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12230 10908 bytes
SHA-256: 63d9e3b311f3d308fba9f2fd5111267c7ab2efd0c659ea4c21aae61944280689

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