Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47a068c9ccd9ea1…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 07:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07ac8be0966d304b32d4e51a300360bf SHA-1: bf4a47367ea6666d6cbc4a1fb102b96512367f15 SHA-256: a47a068c9ccd9ea18d14a9d311149ac9dfa4617d3e935bde2ab80de4d7cedea7
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised or disposable hosting, suggesting a link farm used to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cheapmarkt.com/userfiles/file/98977281528.pdf In PDF document text
    • https://medbillings.us/lightspeedweb1/file/miduviwetapezelepiw.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/watepajefonu.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/25291674459.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/bosovavabi.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/14608266874.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/wonikikavafuleg.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/90955225976.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/9524946621.pdfIn PDF document text
    • http://nut-shell.net/upload/files/33789002904.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/jemonumasuv.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/66298262336.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ec461cb1373d4baecfe59d231aadae77/jetogafizewasijuvuvujoba.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/3040336868.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4c9705d6---zodiridokasonulizukakadu.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150453ba1447---zokedaxetonopemitumefaz.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/5492068259.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/taraxexis.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/13338900834.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/bawigesuriruwotun.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/nafuruxofedaj.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/segamofegowedudakadave.pdfIn PDF document text
    • http://salespate.com/userfiles/file/golimovigijupulisule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=transferring+whatsapp+messages+from+android+to+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_off0000b002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB002 10948 bytes
SHA-256: 7b71d50c9b0db5e802c8397c01e69416d4664f0eb36c60b63dba90484c3fbfc9
font_01_sfnt_off0000c90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90E 15780 bytes
SHA-256: b3fa976f769a4a760788f617030df34feeb4fc88a68025d6b301b743a41e0304
font_02_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1