Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1295af7db62af99…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 22:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ed3851fe25bb2a27b93213ec442d26c SHA-1: 28e0d0ad99d5c682df103d4222df0ba06bef038d SHA-256: c1295af7db62af9934cba28f3b99987f6f07251574835e6bf16922b316aadd8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. This suggests the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://twtime.com/uploads/files/202109030356082173.pdf In PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/67421434714.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/8ec889ac054abdb5eb1f21a2c905b376/mitivosakefare.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/nefig.pdfIn PDF document text
    • http://klenderbio.com/upload/files/dagepixab.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff78c67ec3---90479416692.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b75088f4fd---65496193237.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/vozakezi.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/13129110391.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/ligodemuv.pdfIn PDF document text
    • https://ratoempat.com/contents/files/lafabusuvepofasux.pdfIn PDF document text
    • http://biosite.ru/images/news/file/jofinujifabuvedoratimed.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/9588176758.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/vuvitibisezozupobuteki.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/53901233332.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/fetalajasoduf.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/fewisugaf.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/mixafusubiwero.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jafapurimipebididilelo.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/68651db7f5fc5ba0e7157e2c5c1c7bd4/43894768468.pdfIn PDF document text
    • http://ihdbd.org/upload/files/tupuzudixiji.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/21091310153966853010vyt.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/83923748742.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/sarobava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=google+play+aplicaciones+para+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_off0000d652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 10744 bytes
SHA-256: b215fbf8fa369a181335b6b19a495b78ee702988881f3e37ad3d4637f4224120
font_02_sfnt_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 15988 bytes
SHA-256: cedad97bcfdd7fe16f6c5c90636d6523c5c216f43a919b61edea07ea1f99dc41