Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3aa50e03f42c450…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 19:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 62dbfc6a3c72daf1a6cd6cb43878f9f6 SHA-1: 82da64d962f54186e473dcdeec1291736ac08070 SHA-256: c3aa50e03f42c450e6a77b0810ba7ce451717c58d3c5327504af2ad16a778042
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains. While no scripts were directly extracted, the nature of the links suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865adcc9c21---83087852691.pdf In PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1654e406eb---22745982734.pdfIn PDF document text
    • http://abnicum.com/files/file/sapemoterifoxor.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/19762075173.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/14278580418.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/26723172463.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/lunajajavixudutuzejupezi.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/midozijabipad.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/sipuvirimowi.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/05ed4173449825777ef5ca4a7b7d59dc/14800658352.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/wogotiralukidugesafu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/323580d40ad881cb699384fcb9381eaa/vuxuvoxares.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/62498032944.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/34309152305.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daaf0196f0---32483975737.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/dizixikinadex.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/jumaju.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081779d9f0e7---nemomori.pdfIn PDF document text
    • http://cx-gl.hu/images/files/wozomutifejekegizipijenub.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/jubugebawiw.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5nvj0kg1p3ugrd6v18j9mnl0g6/pofeduzod.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/7282215829.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e57733891d0---nanap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=stannah+stairlift+300+manualPDF 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_off0000e658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 10696 bytes
SHA-256: 812ff2de34575ce8564d02e21b27eab77eb14a96bbca1f835e01deaf541a0a40
font_01_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B8 16852 bytes
SHA-256: 6800ba1078bcf37d3e030a042b9fa65b40a14c7fd695a4bf46fe254922b67a71