Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c6b65fa0cb42ce…

MALICIOUS

PDF

80.0 KB Created: 2021-07-02 16:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b4f8f0fc096aa084b7231da3ea7f762 SHA-1: 5dae4bbe61afe2f1706dab1d26c108ecc797a5ac SHA-256: e0c6b65fa0cb42ce4224e64d50230c2e560a6dd3ffe05c839e95aaf6f27aa2d7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly supports its malicious nature. The primary attack pattern involves directing users to potentially malicious content hosted on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gyobel.itpublic/file/88964608625.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/dd9c22a76a35f77ec31a698b0a3e9c33/domorudulekowagexorufog.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf3b799f3---xofozalixorolaf.pdf
    • http://omak1968.com/clients/71178/File/bewazibuwase.pdf
    • http://heizler.hu/files/file/ravubidutekokimaf.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/5931c8125b92855a246d4b301063c16d/wededupokebubiv.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/o0hbtis3871b8sjjsr8n8038s4/56550840028.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7bcd3f6041d1333c6c03f1d8fae4c94c/88010673457.pdf
    • http://vladjurnalist.ru/archive/file/8800570208.pdf
    • http://www.lugashotel.com/data/editorfile/57202304532.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/vewesoxoripepasa.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/bf1b7798088e9be06e9c7682032d760d/kepinodikosinafuze.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ve024o6mpfqf0a9arq5vurmkvq/87983653511.pdf
    • http://bogelaipigeon.com/upload/file/vatevamokapid.pdf
    • http://bsbcarpet.com/userfiles/file/74137721075.pdf
    • https://personnelcle.com/userfiles/file/89472430603.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160acccf8506da---10196629888.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed3819259b---levebibewutu.pdf
    • http://comp-art.ru/userfiles/file/lafelukopaluvosoxekow.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/7r9hro1sefml546fu6uo0k4cua/pujaxejovape.pdf
    • http://aite-materials.com/upfiles/file/27531509163.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d09430fc67---43565605201.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/9471366203.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/465f229020895ecec9e7e7a9193cfc72/pojomunowafokevixofavu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=under+root+of+negative+number
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d36a.bin
28c2fabe97d94c111ea08cab527695cab019f3b4989ec7f51a9a3a3e48285f6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD36A 10796 bytes
font_01_sfnt_off0000ec18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 16792 bytes
font_02_sfnt_off0001042a.bin
5f69e597fed5602ff747074416b6c2a7d55bc1134aa5f84f9b39599cfa5ae9ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 17608 bytes