Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c2a9b7c30378c5…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 01:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 05ddd78fba0ef7bd39ba3c704d825e0d SHA-1: 3a3e14bcbedcfa55348f136a6c06411414c9da2c SHA-256: e2c2a9b7c30378c50ed1ae7ee84730c34f0b971178d0a342349e77a9bb95f001
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various domains, several of which are hosted on compromised CMS uploads. This suggests an attempt to lure users to potentially malicious sites for phishing or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://gangwontaxi.com/FileData/ckfinder/files/20210903_8562D254043BBADF.pdf In PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/dikemunuvonugutuxe.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/35555982104.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/ponigerevi.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/57583391653.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/95911603431.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/60157354661.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/55516881850.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/1060002034.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b626423c60d05eb40ffd74f27707b814/dafukerarowapavek.pdfIn PDF document text
    • http://wohingltd.com/userfiles/gefiledasejevasamituw.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aacc11c392---zepafuzugufor.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/82462880001.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/2815465523.pdfIn PDF document text
    • http://rurisnet.org/images/file/31041052339.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5eaef3e0---52947024182.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/77668975768.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef08d3a76f---49847898680.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/65831773764.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/kafetivusofasesasulaf.pdfIn PDF document text
    • http://hrudolf.com/userfiles/53374404909.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/86358680310.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/64604110041.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210901_537C9108990AB0F1.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+stop+notifications+on+mac+from+websites+chromePDF 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_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 10916 bytes
SHA-256: b8ba2ddefdde9c018e397ae5063e4a081a43ba4e8e4584bdadaa7027ec5f296b
font_01_sfnt_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 18236 bytes
SHA-256: 0161ad8f542371bb3e035d60d6d2ea392d29c7966489539d000209781be4c3f4