Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5e6393cf42ba58…

MALICIOUS

PDF

64.0 KB Created: 2021-05-03 06:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cef4f6fd76fe5f5920816020f74bbb3d SHA-1: 324fdbe90aaca20f44345924be6553214a0545d1 SHA-256: 2c5e6393cf42ba58f8d43e4d006c392566b365f76c03c5a3b63de826a3366df3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

Heuristics 5

  • 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
  • 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://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c010d4a278---44266758160.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/46d7b7b2c7d8886a4e0cafc9159478cf/pawifabexuvobapizugolula.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d161bc434e---43369268126.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080fae99dffd---67027296716.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073608fd5349---12737904337.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd066497e---92278042352.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/8b87595715365e77dd250ed0c6f313f5/soramubiju.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4sqtegrshqcuccu520sgrsodh6/28205381745.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160752761abf22---3369221410.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/dde07028265dcd94f03f520ddb705b8a/pokimavisoradurokenijuvuk.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c8e07a65---22114927626.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae72d2a0b6---bareloleramuripajasi.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dc1f4f545---nijofebarosoborevideb.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7vdlp2gq2nphq25h7pnkacmaid/potikomirev.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608715759bc6f---71981707081.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608421ba86012---34046303636.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=welcome+to+lesco+mis+report
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cef1.bin
3497ff6baaeb154488d69fe4c65d821d90963b5ecdcce616d2626fca87f2fe5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF1 4884 bytes
font_01_sfnt_off0000df85.bin
1d64854318902836136e455a3fd37785cd5fcd113859f80e908ae0ae0973f6b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 9972 bytes

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