Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1feb4347ab4675…

MALICIOUS

PDF

108.8 KB Created: 2021-08-26 13:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 6427703218200c34dd98ddda69cdd47d SHA-1: 1d9d763364e59f5cd68e1f0e765ccb6eb30840aa SHA-256: cd1feb4347ab46751bc6b4948833c0a588e2b8435e616ec31b4793a74f948c3b
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it functions as a link farm to redirect users to potentially harmful content. The PDF structure and embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee6b45e24---mefemosoz.pdf In PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16125f3749e247---fogivogitunorukemudelasel.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/10114673315.pdfIn PDF document text
    • http://faradbox.pl/files/file/rugopawafosokuvomevom.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb4686c97---85073784519.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/jipomibafotuvenuroral.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/98f2dd8e58917c0ee2c5dd920f84af51/jedotuz.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/suxesiwikened.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/697ed9a5e87627b3d7f312e870dea0c2/lobofuvajajejazexafog.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160902f9f26851---nubomit.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160801e1638893---vizasa.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/91973867522.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c958f081e3---34853745908.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608723f62cb17---10470789467.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/mixururarixanufelalebur.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/winapegomuromarabumaj.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b6c7a0e31---vowixoripoferakigusanat.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/155ccfdc50e322baf2dbdb79018e25a8/juxebelimavajudalus.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1558c892b67eb8498f3549f75b7b1caa/10344813455.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/ledegajiluriwapak.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/vowigevamulokezu.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/77480476170.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/wuxozefafujivawogojif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pisces+and+aries+cuspPDF 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_off000147bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FCD 17200 bytes
SHA-256: 2ead982e32f1cc4675413a3a0418fd457605ae9d1a4d55a93ed7ff5908004e79
font_02_sfnt_off00018c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C77 10344 bytes
SHA-256: 0fb5f3b2d0d55275efc2b4907b2dde1a8a5608f22b9372c5158c04ac57e1e98b

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