Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9e498830bca78c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-20 02:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a1ea7b1a3aafe710e996b0657bbe9646 SHA-1: 86353ea0abfc76c2aaa3cad1db2ac531cad88e71 SHA-256: ab9e498830bca78c7a333557c6947bda79b0197bb694821a3c7eb70962d7a3b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://garglob.ru/uplcv?utm_term=mi+box+s+install+chrome PDF link annotation
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/mobeleduvudelekud.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/89970247658.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/sasojegat.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/mabag.pdfIn PDF document text
    • http://aa-nusd.jp/kazijaziwomad.pdfIn PDF document text
    • https://kaparatt.com/images/File/67515826510.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/96975741862.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/49367476543.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/mikat.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/43429366d4225df2580385b4106c3560/95918601055.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-14/20210914081548225308.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/9930986964.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/teloxidu.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/72497318464.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139851cd6e6c---moridul.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/19170631480.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/zedazonul.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/56298114259.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/78259536215.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/palefiwoxoxunitot.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/wogaj.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/niwidufa.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132323c7395f---90667240855.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca9ccd1a4d---tapuzikaribulama.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-16/20210916061921260408.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_off0000b8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E6 14912 bytes
SHA-256: a72188cf1b2fc184bb73669e78e6c5364ffad2cb553bd610c313b982b111c7e6
font_01_sfnt_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 10728 bytes
SHA-256: ccaafdfd51b02501f2dcb798adecac2bd5200ea755432434b65401c6f0f0ab59
font_02_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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