Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf8d53c068f7307…

MALICIOUS

PDF

116.0 KB Created: 2021-07-02 00:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d2e48489cc4c8a9f063273a083ec6f88 SHA-1: 32b111586f256fe0d6b544df0fee6d476fe3dcc2 SHA-256: ccf8d53c068f7307fa124a0c392994dbfda3c28f9ba2b4b16c442d5a18c0ae9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096abc629c11---18377101659.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608e275b9869e---70298773250.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/rudafakabujupumeta.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/3205968125.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/67521038682.pdfIn PDF document text
    • https://go2germany.ru/files/file/sudulov.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/39015438356.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/29rsat8tufsbiq5r4p8neq56hn/solopiloza.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940cf20bffe---zevifawez.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/detederuwu.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607177904ffea---29382270521.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/19939595203.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/tokesemomu.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160724760ba9f4---45310789018.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9635b8ffa---79287608586.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/9a1bda4de96442aeee780955d66ac14f/4114127868.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/47464955648.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/489ee3d30247055f36a3d04d858e14a8/mugiwu.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/49707310542.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/cee3457e816c4d4deea85d1601632020/vegisebajatilepusajizu.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/a9d175a25e99d5d22af00036bf03f509/35401507274.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/vinajubatemed.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e2ef623a572cb7a96b037a3627832d5c/43866139223.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a58758cd38---53439201375.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160baf3790b533---50015368725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gerald+durrell+the+entrancePDF 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_off00016365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B7C 10224 bytes
SHA-256: cafb0d8201a458691fba0ac7461091782246684d1c14870105e81aaf01dad117
font_02_sfnt_off00019259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19259 19160 bytes
SHA-256: db22bf2d1f53f795855d38c160ef70b8332d0cc8f671d47b5c4fa887027b7b16

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