Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1347e389b40b344…

MALICIOUS

PDF

87.1 KB Created: 2021-09-07 01:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7195f834e509b4036842acb1dd530ee0 SHA-1: 4fbe3db31f79746d1bc928773d02c5bbbfa76922 SHA-256: b1347e389b40b344232ec66c3d2650ed8fbd1ff019bb3502599ae7e12822e1b8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://copperscraphandlers.com/ckfinder/userfiles/files/zamusunebo.pdf In PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/4baaf23c8744d7d6313b958d4da28cf2/38786950907.pdfIn PDF document text
    • https://ikansambel.com/contents/files/30129777957.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/gojaforefokuxim.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160f22d28caece---38728745394.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/83628796695.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/zimupe.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/xepebotimex.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/39564620848.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c09a49770456947d378070f947ccfb49/leweledixusuvidilu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb33e56a153---lubejepisuradupu.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0k2ff1o43r06ep5ag0gmd5t41q/73590322072.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/kofowunoluzuj.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/kufexaza.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/tikebara.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/99dme3ouuroinm2brqof7otbpg/81733785555.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/86eea986462fcdec013eea40135186b0/xozadapenoganon.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/fuvumorupufewiwelozeg.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/90547315081.pdfIn PDF document text
    • http://mamsongdamchoi.com/images/chua-phan-loai/files/napimurugibizum.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/73922106831.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b50f5de11bd---65110361086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=corrosion+prevention+techniques+pdfPDF 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_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 18500 bytes
SHA-256: 1960da7f03b24521102d1f27bfe5270d4f569e179cb4185754c0c51b4a972b2b
font_01_sfnt_off00011dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 10852 bytes
SHA-256: fe124af22699082f67594d8b9b7ebad61dd84e39771f98e3756b1d4cafb5ddad
font_02_sfnt_off0001369c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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