Malicious PDF — malware analysis report

Static analysis result for SHA-256 64cc5bf58a641399…

MALICIOUS

PDF

74.7 KB Created: 2021-09-04 07:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a008dde1283366e5189402c7e06e7938 SHA-1: e17a07d24d682e0a2b6cf7ad3f633ecff84296a7 SHA-256: 64cc5bf58a641399cd900b5cc0657e7ea1ef06d228681f199bb1847c3524ad1f
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous links pointing to compromised WordPress sites and disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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 https://smidgel.ru/uplcv?utm_term=kitsound+boombar+bluetooth+speaker+manual PDF link annotation
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a66a3105a---bozivesuvugazib.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/6fceab9a9c37e9e6a1dde24ca9188578/satovabi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/49363760723.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/4282814559.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/vopivaditijimodapakat.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/39d2q2l7cj61ricm8r0urgirer/33814343064.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/6512430300.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/ziwugakilitaxuvejixamebuj.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/sikeme.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/746fbe5231170cf5b95f5578e673fca0/kuloserunopadivukabuniru.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/10152985192.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/54781024841.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/89295957423.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/zojisigekumusosuwefekabuw.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707f861383c---volure.pdfIn PDF document text
    • https://khanikango.in/file/18523910899.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/7fgqm1arf88pb02mife31d0sns/sosagubegagefotekutaxofi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd90a9eb17---5714302309.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160beb5883bf62---89913399808.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f277780bc71---dudexekirisaxojuxulume.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b7e54480ef165fd3613ba95c4cf527db/3622357339.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/93937015949.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/70801204242.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/xopujopepipewurero.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 17300 bytes
SHA-256: 1b3f89178ffd8486d82c649928791b6d874ef8fdc451a39665ff29aa9d11f459
font_02_sfnt_off00010379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10379 10980 bytes
SHA-256: 12c59781c3393003488104b0bca864910e80c760a21e99e43976cec430ee0208