Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadfccc6ca2db4b4…

MALICIOUS

PDF

72.0 KB Created: 2021-10-04 04:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fbd85b22bd89e6c1afb05da90663f773 SHA-1: 99a4fd48123b7450a97be9e732ea461684bf238b SHA-256: fadfccc6ca2db4b432bd6bb6988956e862e7f2b06d16586f68fcc40b8a416dd2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of numerous external URIs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/uplcv?utm_term=partial+prothrombin+time PDF link annotation
    • http://hodori247.com/uploads/files/rulodowiriwu.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/pabofezisopus.pdfIn PDF document text
    • https://shevian.com/images/file/varoletuxunadipumag.pdfIn PDF document text
    • https://latework.cz/soubory/56610888684.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/62603759226.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ab04d2803---dujibojowomesim.pdfIn PDF document text
    • http://skorepka15.cz/UserFiles/file/63907151342.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/majulogeso.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109052205436851.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/75984276783.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/5127532981.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/3aeoqi5r8gp19o8fraju9lmouh/41103670809.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/25017390740.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/50772532821.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/futevakelunesi.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5d9c462f1707e5037856c0e877bae368/xazoja.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/dofapufewi.pdfIn PDF document text
    • https://4u70t3k0-4tl.com/contents/files/xomatolutejukobojali.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/10280051658.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/ruratenetaduj.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/895a18d812958d3fa014ed5bd4bfe646/17180372974.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4d854fb8---90137128867.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/memitod.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/59597496520.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ckltpibo3h6hlr03qshk6mvpom/sopudutowujaseguz.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161484bbc41865---ragejexasufamazubip.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_off0000b589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB589 10488 bytes
SHA-256: adbaee934d954606a2f4cde2d370dbe9894ec22d9ec204bfa40224aad8590b83
font_01_sfnt_off0000ccdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDD 17708 bytes
SHA-256: 69972d30a703a2326e91679ae6579501fad012a50a8f74f8d1d5e9d16e8c8394
font_02_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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