Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a659c484b95dafe…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 05:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2edd483b0db6f5e51a002c78c87e3ec1 SHA-1: 5aff69d080ca96f9aafd2b48f3e25fb55cffe9c9 SHA-256: 3a659c484b95dafeabf54b614af71585b826f2dc0c64a7f333a342264e0f7d36
156 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 potentially malicious domains, as indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://damsindia.org/admin/uploads/file/1258666651.pdf In PDF document text
    • http://yourbuilding.ru/userfiles/files/19838477456.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/36321337859.pdfIn PDF document text
    • https://termoformat.md/img/files/liwaredabarugivip.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109120829371665.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/luxukipaf.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee19419ab---gepakazugitut.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/67704506141.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/sudakirigerefopu.pdfIn PDF document text
    • http://taociren.com/upload/file/2109111655521641262nfrb899a69r.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021091209585340547.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/vofanijugutav.pdfIn PDF document text
    • http://feminella.ro/upload/fck/sesuwitetifeguviwokusafef.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/julivabesenoxutu.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/wariduvofi.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/13130012230.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/texafufovinikaxinosafafi.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/48700839694.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/nogasitodukulusis.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/misewisuxumatoxek.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136f48067a15---wiluxajosubedurowujo.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/bofexuxikowuwuviz.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613793cf1c019---1126659674.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/27447500833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+check+device+name+in+androidPDF 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_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 10656 bytes
SHA-256: 2ed433daf5903b9610db833e3ef682fe2ed8370ac6cb9f2d8705f06df04fa878
font_01_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 17700 bytes
SHA-256: cb12f69d833614801ae36b420e7c03c25d94ddf4eea99a50edc2c682f58fa90f
font_02_sfnt_off00012916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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