Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f65817a436bb721…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 07:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8a2465de2f64d6887694241814c7026c SHA-1: bf13eaefc6fa468fcb27a4bfeb35fff959d34d86 SHA-256: 7f65817a436bb721bb514cd2f4ebdc8899642346e9e1ec204ec7aecf65f23033
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://vektor28.ru/userfiles/file/loresozavu.pdf In PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/56719719304.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/67671322437.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/11696356469.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/61749012963.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nerekew.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/sufajinudejoretikat.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/46847570028.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/78504413429.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6e1d4ce5f---dokususemasu.pdfIn PDF document text
    • https://fivetc.net/uploads/files/69344478370.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/49302484151.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/76315526455.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b4735234e---sizuwirobitevukasopev.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/lutowenomazolo.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/kivolanefizojivezid.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/kovemi.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/xetujifal.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/govupituse.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a544658194197020756dcb148704323d/16337935144.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109231525389491.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/sejezukarewawotitaxiwuzor.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/pifadorarogigiteli.pdfIn PDF document text
    • http://519pf.com/userfiles/files/videlipuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=worksheet+on+comparison+of+adjectivesPDF 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_off0000b30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1F 14452 bytes
SHA-256: d536431e37c3d6d0f3c24001967f5d8a0f5659428e5ef3a74f331dff088d09a9
font_02_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 11120 bytes
SHA-256: a9753f5d61bfe9a24ea16e28b6f086d2984266e2a1b629a0203a60a6298ee57b

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