Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63d8e4fd34924ed…

MALICIOUS

PDF

88.8 KB Created: 2021-07-21 16:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 367431051cef5b9db4f47541a7ed3088 SHA-1: aab553d50776a751f8e3d60d7f62d987fa62ab02 SHA-256: f63d8e4fd34924ed4d6a62f5d2e5816b4afcc486485628e536cfbf26898844f8
156 Risk Score

Malware Insights

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

The sample was identified as malicious by a ClamAV detection and an ML classifier. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users to malicious content or phishing pages, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b92ceed1---raputaguzi.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd7e2b74e---22807383668.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d602ac9c64---bugojopewimazebir.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/02gj1mus1sfjajddg99uab3m17/32891838717.pdf
    • http://annandale1963.com/clients/69704/File/65458073136.pdf
    • http://supporttmes.com/clients/2/26/2647aeee05d38019bb2ff7af4ee9f9d5/File/19553592334.pdf
    • http://angeladaniel.eu/uploads/files/barowagevepobinebali.pdf
    • https://jooli.ru/ckfinder/userfiles/files/795501677.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6d5234a9a4f371f0803925e3e5df34c9/81921963835.pdf
    • http://cokhiminhhien.com/media/ftp/file/72108712150.pdf
    • https://kitapkaplama.com/upload/ckfinder/files/jifemitofilezarariruz.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/vukn6lv25rkc44oqomb3i70171/bitenamevasewaxa.pdf
    • http://sjar-tech.com/uploadfile/file///2021052914511743.pdf
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/47334876761.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e30c7eded6---vabomegafuxafovugalono.pdf
    • http://morethancars.nl/uploads/edytor/file/15421009765.pdf
    • http://martom24.pl/martom/userfiles/file/berupejubajuguguf.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/jexegikazifuruwexaf.pdf
    • http://theheavent.com/userfiles/files/50291097465.pdf
    • http://perseverance.cyou/updatefiles/file/wivufezomevirerugava.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=destiny+2+charged+with+light
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c7.bin
709285ab68a860417badfa397d1f3cd4cd8d322bc1e7bd3773252e46fc7ef6a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 10852 bytes
font_01_sfnt_off00010fc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC3 16792 bytes
font_02_sfnt_off000127d5.bin
6d91798fcc4cf8401cd394f34078738f424409cd7c6afca3710ff543fc428fdf
pdf-font-stream PDF embedded font (sfnt) at offset 0x127D5 17332 bytes