Malicious PDF — malware analysis report

Static analysis result for SHA-256 00d914f3e5ea735b…

MALICIOUS

PDF

90.7 KB Created: 2021-07-25 05:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 677c2967e0e0d932d89ecdaa0951d0aa SHA-1: 8cc590e2125656b83304d139a265327def926ad3 SHA-256: 00d914f3e5ea735bcc4efb7f4538e82cbd82b90cb48b060f97fa033faf05b30e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The document body was unreadable, but the heuristic findings strongly indicate a malicious intent to redirect users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/fp9nbb023d6o5jq73ts92g16i5/27303984831.pdf In PDF document text
    • http://aexpress.lv/index/images/up/file/vabarilix.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/79973970573.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/51076590755.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/86759229600.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeec3e4fa7---doxizagenakibujumifejazoz.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3a521ae2a66a1f688c24b34b5854a77a/diwozazawunefilolofur.pdfIn PDF document text
    • http://edgecs.net/documents/vudal.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9695f0ad077eaa8f4177fbb743f50d2c/48586331879.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/20234178365.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/zudinumapul.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/a6056a5954d1e4c76dda0bc8e4f59ddb/weterewavivafunefodetoxem.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/h485hvmo1ampf1u2tf6h36gptf/vekepexedugif.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/404dc5d7201334db8f2317ab58b43740/6631645998.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4eb1680ce---kapabaxuxuje.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609af8aa304a1---63105098534.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/bjo2bh7dpa19ud6j9e5ck88en2/kukafogumurajamudozokagir.pdfIn PDF document text
    • http://hotelhoanggiaminhchauquanlan.com/img-kskc/files/lafafavopuxuwurekan.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ae43a8f4e78c5a53bbbb3a3450433d51/patesigijevakovesadujot.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/atkcauut7eanfqfeqcles6nff7/fipul.pdfIn PDF document text
    • http://usmleworkout.com/files/file/vibisudoginiwavu.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/25826006935.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/85ac52d9499161388a2240b36739e169/21150382708.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/74444590580.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/87176994357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=can+you+change+a+kindle+fire+batteryPDF 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_off0000fdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCE 11064 bytes
SHA-256: bcf8dcb3a6caac6add310425324095567b3c77c44303538ad22ba3ab6dea86eb
font_01_sfnt_off00011756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F68 17024 bytes
SHA-256: f2679e32bc7197cdd77320474fd1f0997dc75b5f4e7ffbf13315d2b26b347ca9

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