Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0307b567aecce8…

MALICIOUS

PDF

193.9 KB Created: 2021-07-07 15:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 6647085676bee9b85668b9d5c4631619 SHA-1: 2c49e5e8218a1c0b02a13c46396a9f5699865fc2 SHA-256: cc0307b567aecce8b1ebe6df90cb5a9eea6de699f0280c078b195cbab4df77ec
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9430

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075693f56ad2---72702037985.pdf In PDF document text
    • https://hyundaia.ru/userfiles/file/7267987302.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/97333321766.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869e242e750---63478773401.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/navovoj.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/tm8df4ait89t3s4obfspj6h677/bebolifuxumiramudaj.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/k4o75d7vo8a7ridgslj4kfe5i1/godeputa.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1da01eda9---poxunegogudaxiwe.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/menokisejijimijodobomuxug.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/29564765509.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/fufawobalaborarik.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/7c86667e68ff1e139eb7e4986bade5a6/67025602603.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084190d21ce0---zitotuwivumojizisagu.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/49ccf4caf91a5a50985b5e07e218ae8b/33790542013.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/64797102294.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/gel1koltj9n44d6qnkkpmpm5m3/nokuna.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/hlf8ashatq773jsn63qrhi9p68/51969855931.pdfIn PDF document text
    • http://innotack.com/userfiles/files/verivo.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/b3798a7d10f20e81a4d0b5e82cd72a06/favozud.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/sq6ucvhdckieuomr6cikt3isp1/30864256442.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077591ed3fa5---kibafedukuwaxidufevix.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d6887d5fc7e---pusopilubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fast+and+furious+filmywapPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/8cfedf60d84921ef0099950030f3fbec/vukukefuxike.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00025ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25EC9 25616 bytes
SHA-256: 4ce9e650fbdd723115150d66acda0529023e600ad47ea822fe64b0e498209e47
font_01_sfnt_off00029eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29EB1 4204 bytes
SHA-256: 0c606d19910e3836597d49e4c22b0e10d77756a03c4475f8473346ebd8d9c365
font_02_sfnt_off0002ae18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AE18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002c62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C62F 10804 bytes
SHA-256: 4f4882a95acdee202ce2cd8f452ddbfa16022733d024529bafed1136af9250f3
font_04_sfnt_off0002df19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DF19 17444 bytes
SHA-256: b61b919d3f29f2e5187d40a83dffed8cb85d8b02b081eafbdee58896c7d50aa2

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