Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9bb2529ef0b4d6…

MALICIOUS

PDF

94.5 KB Created: 2021-06-28 06:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e0cc8cac43a715c64eb14ebee7fcf641 SHA-1: ae607c7a6a02a7d5eeac9733d270ed66df67135e SHA-256: ed9bb2529ef0b4d6a27aec1158e2bc2e40fb37c025f103809b51db623666c97f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links, many of which point to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of link farms on disposable hosting further supports this assessment. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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 http://www.urbanwaterways.info/files/61670111597.pdf In PDF document text
    • https://xo-sound.ru/userfiles/file/89958100431.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/7bn0p2t90l3j4js4kf717hlt35/vizikulipabaxorivawita.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/mbk0uei7i13nqgu5f6a639kvq5/wogozipopuvujare.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a8c300de262fe5225b67eafacc2c5c0e/kisepuguweduwamodij.pdfIn PDF document text
    • http://isgsrl.it/images/file/24774024705.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/kmq02lug9s39h3p3fdg030pgv3/77307639328.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fc4dac042---88578871141.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f2efbc9b3498e8d7f393a8172c116ba8/94694838455.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/dogikivemujajesafunofa.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/201218172204.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25baca85e4---514028395.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6d924e88975ddd93aa70ac9936420b61/dibudafuzanepegu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4ae8888b8---12711526519.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b9c5dc51815aff0817f272c6ffb025d1/72713636894.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0905fa6fb229c1d759bcc6df114a2287/tajab.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/j24ggc92gkr4bvk5n82tv09hnh/tuzamawafaduzizufalifima.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/sotuloputeforaf.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/stvdek3qlo476j58flsscbr2gs/22014993528.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/u1lcn7gksmnq5399a9k9tgb4s6/66353473834.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8c127e1f2796aeaf05bfe4934a43f1dc/fusanojonapetivepuf.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811ddb2220d---divizome.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/genusosilegotozupupafekul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=entrant+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000dbe3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDBE3 18804 bytes
SHA-256: 657316dc5b3d3d009306de63f33c16dc0089dd30e5be042f5416ed1de57f45ef
font_01_sfnt_off0000fb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 22148 bytes
SHA-256: af729a798f93fc35b373013ed423def89978285a71bc6f620a6c007ad4393244
font_02_sfnt_off00013300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13300 2180 bytes
SHA-256: fa3d2ea419c5edea0e4d42a9d38f0f70df95f2244a564702b316998a12e93e77
font_03_sfnt_off00013ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA8 10420 bytes
SHA-256: 383a8f2d09f6b91f18606468ee0de8c34e62b9f7aa9e4640471858fa4699a168
font_04_sfnt_off00015401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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