Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c886228c095e3d…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 05:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1dbf784f60ff6ebce240026870f5a7d SHA-1: a90c7c011a79a05b6cd2bdd4d9a4d9645f73b427 SHA-256: 46c886228c095e3dc29c1c981c61b550e27fc8f3f2e1ddde91347fc1ddce9414
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest an attempt to lure users to malicious sites, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://diamantina-joaillerie.com/ckfinder/userfiles/files/lulokew.pdf In PDF document text
    • http://china-hold.com/UploadFile/file/20210516025239501.pdfIn PDF document text
    • http://mulherinscampground.com/clients/879992/File/19649708340.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd251ec344---7811230582.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/11568341656.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/cmjifq98435ts0hm40ji623fn1/solidemanatofubo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kqsseeplo0oqklsa6emiild4i2/bijesunorifutiwivojuwize.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9649f1c47---jagus.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/38855161479.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4532fb7fa2041d7b2be90fe5e422fb8e/45699416099.pdfIn PDF document text
    • http://zuche0551.com/upload/file/wemukikudopesaxisewed.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/31098874662.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b063e770---rawenatesafuxagasudujo.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/41669212845.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/pizevifupisugovubadipuza.pdfIn PDF document text
    • https://codecs.ro/images/file/38045302245.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/dararubegezonezujup.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/99f1852b3be50ae01366494791c29695/mumebaliwe.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/80275466569.pdfIn PDF document text
    • http://sinoorchids.com/image/file/14488772339.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/tutanof.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/fqlcfa56dkpu1imtcc230igqh4/faxabuwukegubuwiluxusad.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca67a798c2---nodeteno.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/pudopakagupowerutoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=antonyms+and+synonyms+worksheet+11+plusPDF 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_off0000cc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2A 10992 bytes
SHA-256: a115c9c6399b8034756cce715085be1f02494a3fd364bec566b97965c99f6a9d
font_01_sfnt_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 17204 bytes
SHA-256: 16ada9feacbfde097fe13199ab3eeb12c8f33c3d9cbac44d02c7367b5d23283c
font_02_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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