Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe249c8e9280f89…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 08:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 97a54ccfeb52ea2fe344337a782d05a8 SHA-1: 8b6d6a845f6ef8c61295028f714eb5897dbfb957 SHA-256: 7fe249c8e9280f8928fe33073ebaaa5bfccc8d9ff27e1e1b64098235e5f53750
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites, often with UTM parameters suggesting a phishing lure. The 'Remote Support Tool Lure' heuristic strongly suggests the document's intent is to trick the user into installing or connecting to a remote support tool, likely to gain unauthorized access or perpetrate a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://pistant.ru/uplcv?utm_term=firestick+remote+app+for+pc PDF link annotation
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/4702986367.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/wunanoromifavisudid.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/gusunifemamelarosezeg.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/67539461064.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/bagutatiralibovoxej.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614599f82e27c---xarigivemar.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/8812299112.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb2a7ecd49---jiwaj.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/62366232010.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/93333494910.pdfIn PDF document text
    • http://apothepharma.com/upload/files/fefatoji.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210903054720.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/vilutiruxev.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/poberudovuragutotados.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/70052463488.pdfIn PDF document text
    • http://mlight.cz/archiv/file/wafujasexibeduvaxelele.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/97132897281.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145bd3cbf7f6---19064947373.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/betorozapaluge.pdfIn PDF document text
    • http://imoroz.by/upload/file/93308934486.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145e11d43098---76016255870.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a208860589---lavob.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/bugewabuliz.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_off0000e3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CB 17568 bytes
SHA-256: e9a2d6468b42be7d7fe1a0c4d688af0e6794d10d586053ded69eeb6270328ff4
font_01_sfnt_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12965 10560 bytes
SHA-256: a98ab562dcc7e951ea06540b50c7af27d2ad415e6ca682c1d5161300501c015a

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