Malicious PDF — malware analysis report

Static analysis result for SHA-256 1357617c99f740d9…

MALICIOUS

PDF

70.2 KB Created: 2021-09-15 21:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 206489e2078d8e04fb31cc0c12b6fa9a SHA-1: b8ca4ac9cb0ca14ef2ce9375aa38bc7c044d9788 SHA-256: 1357617c99f740d98a681d4d97ae6ee5b2b04c7b7fa33cd8891218a97f6d5494
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially malicious or scam websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack, likely delivered as a spearphishing attachment.

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 https://queure.ru/uplcv?utm_term=granny+hot+porn PDF link annotation
    • http://studioarchterreni.it/userfiles/files/82344049399.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210903_011504.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/34417694603.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/89358533507.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b496ffbfbdf566bb0d26ce667c209e5a/jukuvajuko.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/60746851261.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/zubizuvopixuxadaz.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/22265758310.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/71446495873.pdfIn PDF document text
    • http://lejuriste.ru/files/file/gurabun.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/89636930560.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/74184877649.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/dusanexanusoni.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/44948591260.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e052c4cdbea17bdc4ba188477ad37733/10207054087.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/mejunatorapimumog.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae8cbb0e3---59031806596.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/38692023604.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/38834616088.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/84841333509.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/37814232618.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/14724304259.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141808662db6---43426654209.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_off0000b77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77B 15084 bytes
SHA-256: 849dc3e67fff27a448ae44f57e9d2c2655ee5443a080fb7d80397291130eadb8
font_01_sfnt_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 10064 bytes
SHA-256: c452e431109dcb39bdf676d7a3437da25a4b3b050f79718c347c0bf3f730773f

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