Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fd352845d36b21…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 08:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: deaa276607eba94c296b437a7b16d41c SHA-1: 4e1f3de6a3dfb5e38b8dfcc1e8ea447e7f956618 SHA-256: a9fd352845d36b21f6cbf0a13b25210e7ba3744b2f3f783d006dea1557666be4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=vocabolario+italiano+latino+pdf PDF link annotation
    • http://anthonyvienna.com/sites/default/files/file/4473952201.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/fefiraligoz.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078ea58c5ca3---63240862914.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b34ebd9d---maremovujoj.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/14b0ccb385d3c489e6a3714b7ea0ead9/pelodefotaripojowivura.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/25697513913.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210907060010286211.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/44050211991.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/wawovevideme.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/07/files/210723191451.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccde407485---gujilesiderinadivelakixop.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/zuvefitafa.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/jikesupivovofanun.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d00f291a59---jafixokadumijen.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16690891027.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/7a582i3ingg5444lstv8eaa5v5/bubazawexonerajakesaf.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/xiponunixepafizaje.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/futobofekajajesadutozuz.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/50736084858.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/19827745958.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/758c9cc959471ac156930c22fe85ed4d/75860188424.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2a3245b4---99090316118.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba8e4d732f---2047939619.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2c39fe0be31f3c98bd808337e51e7d3f/59168736532.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57d7a70665---zovituroduvujir.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_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 18120 bytes
SHA-256: 32d52dc51a39ca099a0de5c04a7b11099477ddc03b5b30e98214b560721cdbce
font_02_sfnt_off00012902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12902 10420 bytes
SHA-256: b806509d11d9c454c4774b22a9cea4d84fead934e218975f3e9ba99e2e7ea30b

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