Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad39ebc04755f95b…

MALICIOUS

PDF

108.5 KB Created: 2021-08-08 19:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c137520f94380a9cc84b48fd908d1fb SHA-1: b06d2c04c73ee66f15c17cdd2424caa4ee39581a SHA-256: ad39ebc04755f95b9ce0cb9337cb62f03020fddfec05a4f6792011c07ffedc8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful external resources, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://allytemp.ru/uplcv?utm_term=causas+y+consecuencias+del+embarazo+en+la+adolescencia+en+republica+dominicana PDF link annotation
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d20385bed9a---18314209610.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2d16e1bfc8f15315213f0c4f3894b9d8/89939641989.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/ninebe.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/76044908217.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608895cfc4c61---51786071309.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/davufawedez.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca521c642---5848198126.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160aafc4de370f---32053742903.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf52329a3---jepav.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8704a49e2---40946646327.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ma6ljlihnp7fqm97k0tjk6pdl0/lurejakefukadaxazobox.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/xebejosewafogaledozepo.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/14794997059.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/14517157374.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da151b1212---bulusolalizewomoj.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/60748118589.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/98s2j8iqptnpupsag021usbt5u/72372815139.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/62333557087.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/lazoririxaketo.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754c10dc12f---4863472012.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/81631428333.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3a3d95a1c---65513998038.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee4e5cf5c2---74835504069.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/vifunadezefaroperopatunaf.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_off00013dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000155d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D4 11020 bytes
SHA-256: 03a96e027977b59c8567bb6cc6d871c4684e6f27dd925b241f404945b8f03914
font_02_sfnt_off00016f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F3C 19724 bytes
SHA-256: a2aa6fae81563881f867b1e31ae72b0fde60756aad3aef43bef04999e6a3c53a

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