Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1aab27a9e9b6c7…

MALICIOUS

PDF

96.9 KB Created: 2021-09-08 23:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08f1a1127ab49daf810b57db462f1877 SHA-1: b54a0c6350a9993b59c4f81c0b791cb378053f0a SHA-256: cb1aab27a9e9b6c7072d306e8c2487f07f0b7c190ef5b2641dd2f77ffb409562
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier strongly indicated maliciousness, and the presence of PDF link farms suggests an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the overall structure points to a common tactic of using documents as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=headway+academic+skills+level+3+pdf PDF link annotation
    • http://cosyromania.com/media/file/54929254494.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f879699e9b---zimifazodopukovaxo.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/49913547983.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/bititujakodorifakidalome.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135bd00e7f73---29334723971.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5140e1fcc5f7cf73ca10dacddf1aa201/kareb.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/96621242879.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/wewaburumebutuxedaviv.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/zewixujawipobolapovevit.pdfIn PDF document text
    • https://togeltop.net/contents/files/busajezozikusexekoj.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7ecc92dc9186fae84c129378f1ac6108/6910898003.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/15468730809.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/43318784503.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/senoladifagafibonezelin.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/76812387035.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/75677444921.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/87167649105.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/27200401876.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/76187667270.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/10465222158.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/bumebosewirebe.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/48311084746.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_off000111d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 19616 bytes
SHA-256: b8894171d905c35c1a00cb2aacee0e8fab10a1e6629508e5e2a624ecffcab830
font_01_sfnt_off00014476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14476 10880 bytes
SHA-256: 7fa22443601e72582e3821ee1969ab6158880c5376644d78e97ee6f16eb351d5
font_02_sfnt_off00015dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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