Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41b69d9c8dbc6fe…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 04:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb41bef522d64eefe828b16c35e90f95 SHA-1: 02ea14bdcde4e9396dcf07dcf24c3b5601fe9bdc SHA-256: e41b69d9c8dbc6fe47fcc4fe9868e2ac004c7243dbccc9d3223641722d29ce00
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The critical heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs users to copy and paste content into a command-line context, a common technique for executing malicious code. This suggests the PDF is designed to trick users into running a payload, likely downloaded from one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=learning+the+android+operating+system PDF link annotation
    • https://cplastik.cz/data/cms/file/92713944551.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/pavilubuxivoxegoro.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/94981709935.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/34962666406.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210915_140103.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/doxixasisetakojumevipor.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1c511e14a---73834292279.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/kananidowafukokojonu.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/tejadogadizeramebipinu.pdfIn PDF document text
    • http://nprofit.hk/userfiles/tafojimomutatunutaterofu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e61e06e2c4---sewulixazimobu.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/doketopopitizag.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/huecdeeg69kels5ikjabmvnk0t/26343610699.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/mirapupofozudemexixox.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/jen5f3pv7eqntn2gr0rf5s81d3/92961693786.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/ronixaziwejojub.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/belilaxiruko.pdfIn PDF document text
    • http://littleitalypizzany.com/nbloom/fckuploads/file/tigepub.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/josugotigupibanedenekefes.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/30451097487.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/34347513284.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/widilovevirifuwiza.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/badexed.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109140335162747.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_off0000e235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 17672 bytes
SHA-256: 7513ed3e9b782ca258d660764844c9f1f0d99fe1d691875965960ef725e9c3c4
font_01_sfnt_off00010ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001280f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280F 10864 bytes
SHA-256: 254b3f5d9aaafecb0fb5f1e3723533acb9ecc68fe1b8b8e9021e425c72dfcfef

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