Malicious PDF — malware analysis report

Static analysis result for SHA-256 c828729f080deeae…

MALICIOUS

PDF

86.8 KB Created: 2021-09-20 02:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89dc24d0d4cbb491b2431e8e4dc7cf36 SHA-1: 5c01a9b9f0c2a5825c8d014aaa4c50f841c62a7c SHA-256: c828729f080deeaec6d3943cf4fd593dcda3b254937aa56411301471ca9696f7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including external URI links and links pointing to IP addresses and compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or to distribute further malware. The embedded URLs suggest a pattern of directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://igigeothermal.jp/userfiles/file/kekofovitejadelolakule.pdf In PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a775b58a9c---vetabakadi.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/xojojufipafenusuwerufegib.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/jikerax.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/88931914979.pdfIn PDF document text
    • http://autovoda.ru/upload/files/85836423136.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/80743197322.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/wated.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161315b3d742e3---66364301935.pdfIn PDF document text
    • http://rafaelokazakov.com/file/bilomapulojujufupo.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/rawokewipex.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/24244598701.pdfPDF link annotation
    • http://beachfirebrands.com/userfiles/file/mazitapunekazovotekuma.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/guligizazotofarakepegex.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210909200531.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/bemijawatupinim.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/zozanumepulekefafopor.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/3937316027.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f27aaacdcaaf4fb72972f0cfc7aa5934/pufaven.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/97590243855.pdfIn PDF document text
    • http://wernitznigg.at/files/39859319934.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/xefomajibabajutopaf.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/regudoko.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/fexasaz.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/67700427547.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/tuwudasakovik.pdfIn PDF document text
    • https://ms01bet.com/contents/files/putikita.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630883975_60f4bd8507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=down+comes+the+night+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_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 17596 bytes
SHA-256: 5e04df5947cd5486152b9523157b6f89584a4526e262bc060127db38ecc2989b
font_01_sfnt_off00011ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B7 10844 bytes
SHA-256: 7c4bb31c6f097a7cb1bff9af666900aaf24b566d2e46ddff7e2e0aef9dc57030