Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc48213df1bbbe13…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 06:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6914587ff0607f6b042805141b74c5e9 SHA-1: 2b36da6635ac330b2cdfdd635cd89ca31b5ea4cd SHA-256: dc48213df1bbbe131edb413080edeca54db0472cfd66f968d027878cc8945f34
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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
  • 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://goref.ru/files/file/95984590274.pdf In PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/2923199237.pdfIn PDF document text
    • https://jambukuning.com/contents//files/bijefujimemilu.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/15078842391.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b132507a9df---63314515147.pdfIn PDF document text
    • http://bakoca.hu/files/file/napisawagizejegojaj.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a423edc3025---63491951203.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/96713208519.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/4qh9cvu5ns0d8eo4j6mqeg0vcb/8952856394.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/xidokurasixif.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/fidelesef.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/1706316137.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/negutagotakenag.pdfIn PDF document text
    • http://kookwarenhuis.nl/app/webroot/files/userfiles/files/kisisoz.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/38244863316.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/ramoxoxeforeju.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/85298862436.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/90518583504.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a562fe0f---kafimu.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/pemotujozopapudibezamugo.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/bipexiluzijovisadapiguke.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7282f0e978---renabeverarozawodadaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=maus+and+here+my+troubles+beganPDF 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_off0000dd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 10952 bytes
SHA-256: 1a0661c4664688b7d2cbb1081c3808c1a9b27fc5ef7590e44ad28ee019529285
font_01_sfnt_off0000f69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 18180 bytes
SHA-256: f61f6a652febf5c5fc0805b666ae8d42914df2a010d80fbb4fb5e82a81673a9b
font_02_sfnt_off000125a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1