Malicious PDF — malware analysis report

Static analysis result for SHA-256 750335072e03e1ee…

MALICIOUS

PDF

88.5 KB Created: 2021-09-16 20:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c1f14ba15c6032aa46b6724608772a28 SHA-1: cf249a83a49e2523abf1d11a13f446eff0a39d08 SHA-256: 750335072e03e1ee73eb85517d66f0cb1bf40b2cd0ada321fa3eb6fa1b98844d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to these compromised sites, which then likely serve malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/582a1cba2c667e81c53bbdcd87e2ba26/nolizawibebibijata.pdf In PDF document text
    • http://myphamlulanjina.com/upload/files/togixewe.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/gewipilezoxobeposo.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/jetimezuser.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa3dc8014e---xizididazetukalebuz.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad70bdf070---95699300763.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/faxigojuberijudubelika.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/66966647146.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6137629b8d120.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85034cd52---2035276487.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/xazinovavojeperebo.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/95287871220.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/poxiditupija.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/wikisoxisusugugox.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd796f652---pasamofiviwikij.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/fewavosavekevi.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/kalipusomesirewiwirewaze.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fcn8d914h5a4v0dcvtvnlmmnt3/jivorowokibapafivuza.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/69502799013.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/92068661464.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/83533467521.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411cf66d6fa---mujizorexu.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109151759391765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=who+won+between+brock+lesnar+vs+john+cenaPDF 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_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6A 10744 bytes
SHA-256: 41adce40ac4f6460283f95937e338fe07c270b695d4c622caddd15ec5913b07c
font_02_sfnt_off00012429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12429 18420 bytes
SHA-256: d5e9e6cec16bbbacc3eb2022a35d99ebaadde09cdcaa3f763625e94cd777beea