Malicious PDF — malware analysis report

Static analysis result for SHA-256 0290b892695f203e…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 04:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20b552ea9f762a3c8c5c573400f2df3c SHA-1: 5bfdb0799796aeb0bf7953d8656f8f1a47180a11 SHA-256: 0290b892695f203ecd44b4067721758748b9292a53a6cc89bc151532bd79ed73
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs, including those pointing to compromised CMS uploads and disposable hosting, suggest a link farm designed to redirect users to malicious sites. The presence of external URI links further supports the attack pattern of luring users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://infrive.ru/uplcv?utm_term=wps+premium+apk+download+free PDF link annotation
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/19901374141.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdef929ae7---8647019358.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482131769ce---biwar.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210901_B86F7EA67CA8698A.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/87695951773.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/52851029210.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d00e1a20a3df714ffc5276da74aab17a/dajaxo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d08a8d49b---dumisiradapimenotid.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/84109765369.pdfIn PDF document text
    • http://xhzhengli.com/upload/80410550023.pdfIn PDF document text
    • https://aashianarealty.com/file/27672673554.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1ca98bfbd---37489352818.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/jiserabemadodepofafo.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a53df6b62ae1b5bafe5ba7c42f144940/bevimebopopiselug.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/mekudewe.pdfIn PDF document text
    • http://julianina.de/upload/file/bixadawuwefejetipul.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/guzajozoti.pdfIn PDF document text
    • http://mamitobe.ru/files/file/59439634513.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/rarumudu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/632c1185c4c0a44a483b78a99ad2c051/80976083499.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/safubalumenogu.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/61591633531.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/fopewa.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/83099f41c521fa4a6ce72b8c77b2c3be/71157025991.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/86432416513.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/lemul.pdfIn PDF document text
    • 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_off0000b2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A8 10832 bytes
SHA-256: 25e2c3cae372457008c2d8325a7b3a30e405eb057ad0f3da318d7fd51538a179
font_01_sfnt_off0000cbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 14636 bytes
SHA-256: 6edcb248d53476cd0af38227971083d0eed82738200fcd699b0b8239ed3778d9

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