Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b8996b5f71978b…

MALICIOUS

PDF

92.3 KB Created: 2021-09-15 21:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df99eb5e696239f77d8fa50a0d816ab5 SHA-1: d208ad932000421d8c86ab3d9727adf030391352 SHA-256: 11b8996b5f71978bc18389a3843025c14eb15ee28f5f1d14185198136bea759b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links indicates an attempt to leverage SEO or other traffic generation methods for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d9873e31bbf5d3be081f4da771b48630/notexamajisunavexitadiga.pdf In PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eed62d0c3---ridomubawubu.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/zuzasaviwixago.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/10323188395.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/vaxarin.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/mibozerebutekikiwuno.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f90b3a590---7834813039.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/jatedagusexuraz.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/gepubenaji.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/58475726297.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/kililelana.pdfIn PDF document text
    • https://atiksigorta.com/files/28408753172.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/nunedateruribumozuwi.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/35617709909.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/52559411611.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/26819230567.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/967bc68cda4c688a4851d451c932665b/69456044563.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/4232132571.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2d6d3103---xinazeximejikarefumojigu.pdfIn PDF document text
    • https://penzion-palice.cz/content/zodajixiliwigubudonag.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/lubafufojab.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/wixujagebagegubekad.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/29706428363.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/33228881519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=padmavati+full+filmPDF 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_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 18936 bytes
SHA-256: b491f19382bb8c72c06d698d8ce6cefb1cc541ee1dcf74cafffcd33be2666fec
font_01_sfnt_off0001351c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D33 10060 bytes
SHA-256: b9a23fc6d517366cc97f4c1678ae64eda2e81e2abecc4de7b7a73cc8f64603c5