Malicious PDF — malware analysis report

Static analysis result for SHA-256 895b5f8bc4b82d32…

MALICIOUS

PDF

74.9 KB Created: 2021-09-21 09:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae79f872f050d0bd34f797108e45e0e6 SHA-1: 0f16d3695cdd7e26d36fff3c591bf584a22d0c87 SHA-256: 895b5f8bc4b82d326fc28750c0f8d36a8404ca988b6f72b9cc3021b6989e1259
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions, while the link farm aims to obscure the final destination and potentially increase the reach of the phishing attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.2255

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.
  • 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
  • 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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338981baeaf---kaweka.pdf In PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/83567251077.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/545504789.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/30920977116.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/zudawuxuvob.pdfIn PDF document text
    • https://hobbypet.cz/files/file/dojiwojijeporeranabasafuf.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/jenabodadovefukujegu.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/kofuxifosuz.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/mavinidabi.pdfIn PDF document text
    • http://jn-zhsc.com/upload/pimatowonidugobojarobasov.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/wulimetopakolapurugubef.pdfIn PDF document text
    • http://www.puhito.hu/uploads/besitujalawa.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/34026971120.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/48102362115.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/ropubenujufimevekibagun.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/sejosidewewejuzi.pdfIn PDF document text
    • http://popmetre.com/news/files/zigidinimopidezusosagub.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613616e950a71---ziler.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/pibovenevepevugavogu.pdfIn PDF document text
    • https://gangnampools.com/contents/files/ronosafojilakik.pdfIn PDF document text
    • http://xfswchem.com/upload/files/fefabemalovokos.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/pupezogiwapuxajiwojataf.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1f0b215bf559e614314c133c123e622b/dojunugedinegafubiwama.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/51406574034.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/bozaberusozikutoxewifujez.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/xerisuforo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+put+a+sim+card+in+an+android+phonePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 18320 bytes
SHA-256: 215df0200fb00bc9d4f8e7c1eec9ebf6298e23577d4bd3b3fd36315fefca39e6
font_01_sfnt_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 11024 bytes
SHA-256: f60b2800a862d6e568576e4ceddf84b907feb44c7832b21fc793126849f82031

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