Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f9d57255587ab2…

MALICIOUS

PDF

116.0 KB Created: 2021-08-21 09:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 90e952df8a04312fedc596caa0b5521f SHA-1: 58598d389d242e3bc078371dead300113bb116dc SHA-256: 26f9d57255587ab2a573c525f9adeaa1a1f48d7e8e547e03c2400c3873669339
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_CLIPBOARD_COMMAND_LURE' heuristic. The document likely instructs the user to copy and paste content into a command-line interface, a common technique to download and execute further malicious payloads. The presence of numerous external URLs, some hosted on compromised CMS platforms, further supports a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e77c28407---sokuvelire.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/95710046603.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///80648673012.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/364504778.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/93922239666.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ebdc6d7e6---14764463571.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d4adb7cd2---16741363402.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/72658882353.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/38985622118.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/11597604528.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/82950431668.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d04f2d9d4e5---perotogavujubogetonatad.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/moxak.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f59fc70c7290f1d6fc47445ef9628a5b/17599531196.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d67a8ca4---varad.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210815172903.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/pobenikir.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/gosaniju.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/kagewef.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210606123459151.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16272820425782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=idle+dice+hacked+import+codePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E8F 1696 bytes
SHA-256: 28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
font_02_sfnt_off0001769b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1769B 19104 bytes
SHA-256: ec34e0cb34a193eb9d1d110f78761ae2e02e49c4b62c07443dcdef6e8114c329
font_03_sfnt_off0001a92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A92E 10552 bytes
SHA-256: a4aaa22001d8052340d00510eba9162f9a931d341c0747d60d917e617032df49

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