Malicious PDF — malware analysis report

Static analysis result for SHA-256 9707e23f322e0944…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 06:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0541f01bdf12e4dddf26927ee26b44c4 SHA-1: 77fdd17ee706d9e2e5d28e7718135bc17efa6a79 SHA-256: 9707e23f322e0944e1a20147a6dd1086189bab1dcba10b573cbab987b5f55d65
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kazuma.ru/ckfinder/userfiles/files/72009870085.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e05c4b69d1---zosufakebet.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/79584115574.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/604b7668880ff196c37d999d58191dc4/ruxida.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/84756732810.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/dukusaberepapenosutigek.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/95300c98ba0b569f75f019cba9d2eaca/zikorinisor.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/84854361245.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/31317846772.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/mazejerozuv.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094500479ff7---bokamajovumalok.pdfIn PDF document text
    • http://beateromer.com/bilder/file/wenetufikokatagatatifo.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/pugotategokegawo.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/aob0rjj95tqopqg6tti6rdvrun/sotokalotavobunaduj.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/2300c1ffdc0693acec6dba84b566137b/45062613161.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/71716480437.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071caa1e0faf---nobatulidomiriwuvesixoli.pdfIn PDF document text
    • http://babamoleskine.com/files/file/44380928501.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/podidubefojubekegofolano.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/44778439846.pdfIn PDF document text
    • https://wangwangcamp.com/uploads//files/202108070713056419.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/vezefe.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bc9cb3741---97870483561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=american+heart+association+bls+free+ebook+pdfPDF 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_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 11100 bytes
SHA-256: ed1c6b4967447ebafbf0d4434e278e945b5e528cdb33514a20c51a1bb73c5dfa
font_02_sfnt_off000112a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 18900 bytes
SHA-256: e30dba6b5c69f5fb8d003eab8ed876933f1e943f9f560b5aeaa0f24ec11a625e

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