Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d27d3fd7f9317be…

MALICIOUS

PDF

91.5 KB Created: 2021-08-01 02:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: bb16e2f65da11a11e34adacc4ad247d4 SHA-1: f7785b9f94d81eca29dd7654c24276de1d92d306 SHA-256: 6d27d3fd7f9317be64fbcdf89decf2a7376e8890d089e6e6bd7b40aea16d2e7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9482

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://asea-admin.com/_userfiles/file/20210511003250.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608687110483a---47758918493.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0457ef64---takubojutufadotuzepetuma.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/59848220504.pdfIn PDF document text
    • http://petrduchek.com/files/37289352358.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608038aa18ef7---vuvaxobebipesumotiku.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/rawelonedobeluwojubinurak.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160733bd7c23aa---62687232102.pdfIn PDF document text
    • https://artbynela.com/uploads/file/sonewezusedij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a5d515b80---61889989831.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/jhr8vab46n5v58s8lougg1bhi6/23777578226.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/livovosu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d6c87d0e0d7ab819398d4addfaec8b94/sejokoleb.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/77552637868.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/61411300037.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2ee41362ec04417b70a95eda4c46315a/82573446429.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f32184f1a3---11546758448.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/14038243189.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/99665361363.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/pdp86het2is3q3cjvar5mgvpkp/botawilawi.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6db5a7ebc3---tikatukefosife.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/90f20ff990e6ff30c6aa3ebf3ce27eac/9941826609.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/guvedusilawire.pdfIn PDF document text
    • http://roweryelectra.eu/app/webroot/uploads/file/16204807983024.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/moguxofofideto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=is+animal+flow+a+good+workoutPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 17036 bytes
SHA-256: bd210ed31150c743afee40946959e9673c4e09606b834bc1ef79caf955bf9d7e
font_01_sfnt_off0001271a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271A 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off00013d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001553c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553C 10796 bytes
SHA-256: d59d9d14e587db81ada084d1c01650ef73c480858fbbffbc9aca54f22cf2d7bd

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