Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0164fae9af04e63…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 08:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 291b9971d06c9f2373552eb7da2c0551 SHA-1: b41775ef657eb2afd2d37753bae0c29c6a75160a SHA-256: c0164fae9af04e63bf2381fa47640df82f0c4b76902cc4da8a792a924af8db27
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to potentially compromised WordPress upload storage and other disposable hosting. The document also includes a critical heuristic for a clipboard command execution lure, instructing the user to paste content into a shell, which is a common technique for downloading and executing secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://kfgame.snailgame.ru/upload/files/20210902084827.pdf In PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/070333d84b85b12334e3ec6f72807cd6/negomili.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/vubudevit.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/dumejifusizesipemutid.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_16_00_21_21_9833.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/fumav.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/kakivesatomabozanuwaw.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/kabom.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/24088768383.pdfIn PDF document text
    • https://forssh.com/userfiles/file/tolosumabegotut.pdfIn PDF document text
    • http://minerva-collection.net/files/files/farejuwimamo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140830177db6---9557782480.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/48234489935.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/84535577590.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/zatimemefatuweronifi.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/02cb36ee3c4549db7f4beb11c99b524d/bevajorawasubuxozuvejepu.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/43380527592.pdfIn PDF document text
    • https://teamcode.net/upload/files/77669945105.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37164807640.pdfIn PDF document text
    • http://nature-revive.org/files/file/45261858213.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/57473103256.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed467b73c---95285987901.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/97331530115.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614575e296a4d---vomuxifetutedimosu.pdfIn PDF document text
    • http://safetruck.gr/images/file/kidekix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=wifi+admin+apkPDF 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_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 18636 bytes
SHA-256: a7aea3aa55271dd6370fc48a4fa20da69bdb7da7127f4992f2d3a4a28201e2d1
font_02_sfnt_off0001288e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288E 10080 bytes
SHA-256: 09b3e3591f403f6b079424b446da1b9f2139a588d636cd1d8433555b0f527eb7

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