Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6a23704c2f1346…

MALICIOUS

PDF

74.8 KB Created: 2021-07-16 09:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4cfd00f41589a839450061ee25cbf434 SHA-1: 547f0a0a25a279dac7cb657612fab3d923967d3a SHA-256: 9c6a23704c2f1346cf5a7c22b469c20bf7a7254c3c083ad6a59e5c8ea643dd6f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of an advance-fee scam, containing lures related to lotteries, prizes, and parcel delivery requirements. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to compromised CMS upload directories, suggests a mechanism for delivering further malicious content or redirecting users to phishing sites. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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 http://kiszelyugyvediiroda.hu/docs/file/75816182609.pdf In PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b684f74de0e---nijeg.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160861eb5603a7---zapivabademuxuwowerit.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/e2ok0gam0o19baa51tdlgu3j1f/sibase.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e009b7a6849---9680982689.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a1504524e6a---tabunusefesid.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/jizefodotebibidifan.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/78db1b740057a9fa461f2633865fdb56/raxofezaxisowenudikur.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/kvi4pnvbe0o6gth48th9bafqsd/pajitavodepelenanozeji.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff13e93ae7---82493223622.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0a1f379f2---jixutakomo.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/livuwe.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/lalifovizofurawibav.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/ronaso.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b55cad5d65520611ec6cd25d25d7b8ec/54913798417.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/e223cb390a1463faa62f8f5eda4add07/52478619610.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/21636870646.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/97960091726.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d67fcd7eb2---60278294174.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/98169598739.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160712ca142cc9---83250422560.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/sofojanokodamiki.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f32e59d36fd119d32d4e7482d3999ddf/vojizulurelexadogosat.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16263582057943.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/n16t9ibgghp8a0in97fo5d25i6/35292686542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=25+usd+to+aedPDF 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_off0000c1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FE 10156 bytes
SHA-256: 7f2a041d085223dc0bfc435a74c7e9b1fad0ecdcfd92fe5261518ef197ded0bf
font_01_sfnt_off0000d8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EA 17192 bytes
SHA-256: 2e34685c673c6b52fd63afa8212ff6fb3a2a0d341cff0599dc8f1260be15156c
font_02_sfnt_off0001060a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1