Malicious PDF — malware analysis report

Static analysis result for SHA-256 1048ce6ddd41cfa1…

MALICIOUS

PDF

74.5 KB Created: 2021-09-12 23:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a537349c4799cbf98cb2905c7b758068 SHA-1: 83a883ad9ce8ad213c09fb7c7c812fe485513827 SHA-256: 1048ce6ddd41cfa17f08a0de623f2cbb7918e6836db311fa02aa82e4e4faf530
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 websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of a link to a compromised CMS upload storage further supports this, as it could be used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://haisanquangninh.org/data/dulieu/files/35216406998.pdf In PDF document text
    • http://tolaniprojects.com/userfiles/file/bijupamovalin.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/82127665338.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/sepuvijafubupexajisux.pdfIn PDF document text
    • http://a899.net/userfiles/file/wepiderin.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/28434075164.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/sasaravobegozuril.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/vaxufadedugomup.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/sixiwubani.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/18087101089.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/gofozigirojiwutog.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/10120855501.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/45386394023.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/84384456396.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5298c9fac7005632e1fa9fc9a3ef9ac4/xebaduzoludedu.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/64198230847.pdfIn PDF document text
    • http://dakmet.pl/upload/97075315319.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2cdedcace---78682952436.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/92531051935.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371aca70579---tidifib.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/40444406700.pdfIn PDF document text
    • http://geasit.it/userfiles/files/sepovojopiwobafo.pdfIn PDF document text
    • http://ossokahve.com/upload/file/kesakerab.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/55942336693.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/dajipoloralogefirad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=homescapes+mod+apk+unlimited+coinsPDF 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_off0000bfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD806 10756 bytes
SHA-256: 9033b50c639e8cd07dbb3f46a3bbbae060cc1988cdc140edf2bf08eb9ebafb44
font_02_sfnt_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 16944 bytes
SHA-256: cd44de811b26d31b35456cad8829fb6eb2b0dcf05c5b414d5b45981ece43e7cd

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