Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2a1cdd3d3be240…

MALICIOUS

PDF

70.2 KB Created: 2021-10-03 17:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6eff5486671ee95dd596444a75e1c13 SHA-1: 0592eedef8845c4e6f25604134a4df3a328956a3 SHA-256: 2c2a1cdd3d3be240017c205022aef74bc09161233819a6a140095108fded55b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate that the PDF acts as a link farm, pointing to various URLs hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kotypsy.pl/ckfinder/userfiles/files/82342393527.pdf In PDF document text
    • http://aspbae.org/userfiles/file/48609977713.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/89864241867.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/11717177095.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/tavexowikamivojazok.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/3932952935.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/lakozeri.pdfIn PDF document text
    • http://datcat.vn/2018/file/nalebivotex.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153cb0eaf95f---30092777924.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/xesowere.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/5273b1a43f52b99df5055806c6392771/27887412651.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/90217801246.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dagogepinumesuxagefojax.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/potokup.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/57932071835.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3e359963b---50062237016.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/rujoxojolebulepo.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155bbc4e7586---nezofodopamebu.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/53502680624.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/gakavojabisajilud.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210908_035955.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16158632520141---76305865929.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/5052307471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=entrance+questions+with+answersPDF 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_off0000b06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06E 10596 bytes
SHA-256: 05661a1a44c04fe38400ac5dc05600a09689b39400bc2160d2280c6aeb768806
font_01_sfnt_off0000c8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 16780 bytes
SHA-256: 4407426cefaeea1ac4446d91170d8973c37ef4972016a7e7beab7291b4db12b3

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