Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b31911708cac283…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 19:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c0bc5a827e5595af5f5d386af04d289 SHA-1: 831e51c2af2d640819390df4638ca7b532b6f99c SHA-256: 6b31911708cac283dc4e20a2d32c043e87188307c1f73f41e8b7726b7b49b8c0
104 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to host and distribute malicious files. The presence of a visual download button further supports a lure-based attack pattern. The ML classifier strongly indicated maliciousness, and the overall structure points to a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://automsystem.com/UploadFile/file/20210512033143170.pdf In PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/89492268368.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/ecf0ecacf9d242376965f8a447fd3452/vevomalulebodiw.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fedca30e0---towutarapibaw.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/madotavojon.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f08df970439e119f3150eae1515d71f1/bekek.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/zoxuvumulaxevonekigu.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/19941449840.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/88846421537.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/97486171462.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/zesufabigijonalo.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/16059290731.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210602201103.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f13ff0a5a0---mamojumot.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202108130909225757.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0b4d93ac---tebufexof.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afebf7c806f---pisuzakudikuv.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/68826150291.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e5e899d54c6cba8ce4dcb840b0eece56/45329120049.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/ligazi.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f5509c9e5---dobipilorumedoxunenuvana.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/kq4ji8kvq73rmqk7imu0hd4bs3/60597443301.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078985dd8c58---32725298044.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1a009f421b6694c37f01df155f30c781/93355985972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=manual+screen+printing+machine+coimbatorePDF 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_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 11052 bytes
SHA-256: 4291f57c6384f247a16ebe122c49e87b4e5f8a8cc474664ec9382c39fdb1586a
font_01_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 16744 bytes
SHA-256: 2cbe521104f6a797ae6c416a8fd9df5a5511755fc201a7df4fd5eb0487e19500
font_02_sfnt_off00011c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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